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Sexual orientation
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Sexual orientation is a pattern of emotional, romantic, and/or sexual attractions to men, women, both genders, neither gender, or another gender. According to the American Psychological Association sexual orientation also refers to a person’s sense of "personal and social identity based on those attractions, behaviors expressing them, and membership in a community of others who share them."^[1] Sexual orientation is usually classified relative to the gender of the people who are found sexually attractive. Though people may use other labels, or none at all^[2], sexual orientation is usually discussed in terms of three categories: heterosexual, homosexual, and bisexual. These orientations exist along a continuum that ranges from exclusive heterosexual to exclusive homosexual, including various forms of bisexuality in-between. The continuum between heterosexual and homosexual does not suit everyone, however, as some people identify as asexual.^[3] This linear scale is a simplification of the much more nuanced nature of sexual orientation and sexual identity; many sexologists believe it to be oversimplified.^[4]

Most definitions of sexual orientation include a psychological component, such as the direction of an individual's erotic desire, or a behavioral component, which focuses on the sex of the individual's sexual partner/s. Some definitions include both components. Some people prefer simply to follow an individual's self-definition or identity.

Some scholars of sexology, anthropology and history have argued that social categories such as heterosexual and homosexual are not universal. Different societies may consider other criteria to be more significant than sex, including the respective age of the partners, whether partners assume an active or a passive sexual role, and their social status.

Sexual identity and sexual behavior are closely related to sexual orientation, but they are distinguished, with identity referring to an individual's conception of themselves, behavior referring to actual sexual acts performed by the individual, and orientation referring to "fantasies, attachments and longings."^[5] Individuals may or may not express their sexual orientation in their behaviors.^[6] People who have a homosexual sexual orientation that does not align with their sexual identity are sometimes referred to as 'closeted'. The term may, however, reflect a certain cultural context and particular stage of transition in societies which are gradually dealing with integrating sexual minorities. In studies related to sexual orientation, when dealing with the degree to which a person's sexual attractions, behaviours and identity match, scientists usually use the terms concordance or discordance.^[7] Thus, a woman who is attracted to other women, but calls herself heterosexual and only has sexual relations with men, can be said to experience discordance between her sexual orientation (homosexual or lesbian) and her sexual identity and behaviours (heterosexual).

Sexual identity may also be used to describe a person's perception of his or her own sex, rather than sexual orientation. The term sexual preference has a similar meaning to sexual orientation, but it may be interpreted as endorsing the notion that sexual orientation is, in whole or part, a matter of choice.

Sexual orientation is a concept that evolved in the industrialized West and there is a controversy as to the universality of its application in other societies/ cultures.^[8][9][10] As Michel Foucault put it, "'Sexuality' is an invention of the modern state, the industrial revolution, and capitalism."^[11] Non-westernized concepts of male sexuality differ essentially from the way sexuality is seen and classified under the system of Sexual Orientation.^[12] The validity of the notion of 'sexual orientation' has also been questioned within the industrialized Western society.^[13][14]

Contents 1 Sexual orientation, identity, behaviour 1.1 Fluidity of sexuality 1.2 Efforts to change sexuality 2 Measuring sexual orientation 2.1 Indirect detection 2.2 Scientific studies on sexual arousal and sexual orientation 3 Demographics of sexual orientation 4 Influences on sexual orientation 4.1 Environmental factors 4.1.1 Prenatal hormones on developing fetus 4.1.2 Birth order 4.2 Genetic factors 4.3 Innate bisexuality 5 Sexual orientation as a social construct 6 Perceived sexual orientation 7 Medical associations with policy related to sexual orientation 7.1 Australia 7.2 China 7.3 United States 8 See also 9 References 10 Further reading 11 External links

[edit] Sexual orientation, identity, behaviour

The American Psychological Association states that sexual orientation "describes the pattern of sexual attraction, behavior and identity e.g. homosexual (a.k.a. gay, lesbian), bisexual and heterosexual (a.k.a. straight)." "Sexual attraction, behavior and identity may be incongruent. For example, sexual attraction and/or behavior may not necessarily be consistent with identity. Some individuals may identify themselves as homosexual or bisexual without having had any sexual experience. Others have had homosexual experiences but do not consider themselves to be gay, lesbian, or bisexual. Further, sexual orientation falls along a continuum. In other words, someone does not have to be exclusively homosexual or heterosexual, but can feel varying degrees of both. Sexual orientation develops across a person's lifetime-different people realize at different points in their lives that they are heterosexual, bisexual or homosexual."^[15]

The earliest writers on sexual orientation usually understood it to be intrinsically linked to the subject's own sex. For example, it was thought that a typical female-bodied person who is attracted to female-bodied persons would have masculine attributes, and vice versa.^[16] This understanding was shared by most of the significant theorists of sexual orientation from the mid nineteenth to early twentieth century, such as Karl Heinrich Ulrichs, Richard von Krafft-Ebing, Magnus Hirschfeld, Havelock Ellis, Carl Jung and Sigmund Freud, as well as many gender variant homosexual people themselves. However, this understanding of homosexuality as sexual inversion was disputed at the time, and through the second half of the twentieth century, gender identity came to be increasingly seen as a phenomenon distinct from sexual orientation. Transgender and cisgender people may be attracted to men, women, or both, although the prevalence of different sexual orientations is quite different in these two populations (see sexual orientation of transwomen). An individual homosexual, heterosexual or bisexual person may be masculine, feminine, or androgynous, and in addition, many members and supporters of lesbian and gay communities now see the "gender-conforming heterosexual" and the "gender-nonconforming homosexual" as negative stereotypes. However, studies by J Michael Bailey and KJ Zucker have found that a majority of gay men and lesbians report being gender-nonconforming during their childhood years.^[17]

The majority of transgender people today identify with the sexual orientation that corresponds with their gender; meaning that a transwoman who is solely attracted to women would often identify as a lesbian. Female-attracted transmen often consider themselves straight men, yet some participate in the lesbian community.

For these reasons, the terms gynephilia and androphilia are occasionally (but increasingly) used when referring to the sexual orientation of transgender and intersex people (and occasionally, cisgender people), because rather than focusing on the sex of the subject, they only describe that of the object of their attraction. The third common term that describes sexual orientation, bisexuality, makes no claim about the subject's sex or gender identity. (See also Pansexuality)

Sexual orientation sees greater intricacy when non-binary understandings of both sex (male, female, or intersex) and gender (man, woman, transgender, third gender, or gender variant) are considered. Sociologist Paula Rodriguez Rust (2000) argues for a more multifaceted definition of sexual orientation:

...Most alternative models of sexuality...define sexual orientation in terms of dichotomous biological sex or gender.... Most theorists would not eliminate the reference to sex or gender, but instead advocate incorporating more complex nonbinary concepts of sex or gender, more complex relationships between sex, gender, and sexuality, and/or additional nongendered dimensions into models of sexuality.

– ^[18]

[edit] Fluidity of sexuality

The American Psychiatric Association (APA) has stated "some people believe that sexual orientation is innate and fixed; however, sexual orientation develops across a person’s lifetime".^[19] The APA also says that "most people experience little or no sense of choice about their sexual orientation".^[20] In a joint statement with other major American medical organizations, the APA says that "different people realize at different points in their lives that they are heterosexual, gay, lesbian, or bisexual".^[21] A report from the Centre for Addiction and Mental Health states: "For some people, sexual orientation is continuous and fixed throughout their lives. For others, sexual orientation may be fluid and change over time".^[22]

Gay and lesbian people can have sexual relationships with someone of the opposite sex for a variety of reasons including the desire for family with children and concerns of discrimination and religious ostracism.^{[23][24][25][26][27]} While some LGB people hide their orientation from their spouse, others develop a positive gay or lesbian identity while maintaining a successful marriage.^[28][29][30] Coming out of the closet to oneself, a spouse of the opposite sex, and children can present challenges that are not faced by gay and lesbian people who are not married to people of the opposite sex or do not have children.

[edit] Efforts to change sexuality

Major US, UK and Australian professional and scientific organizations regard attempts to change people's sexual orientation as potentially harmful, while some groups, often motivated by religious beliefs, believe change is possible, or homosexual attraction diminished, for those who cannot accept their sexual orientation.

The American Psychological Association, the American Psychiatric Association, and the National Association of Social Workers state:

“

Sexual orientation has proved to be generally impervious to interventions intended to change it, which are sometimes referred to as “reparative therapy.” No scientifically adequate research has shown that such interventions are effective or safe. Moreover, because homosexuality is a normal variant of human sexuality, national mental health organizations do not encourage individuals to try to change their sexual orientation from homosexual to heterosexual. Therefore, all major national mental health organizations have adopted policy statements cautioning the profession and the public about treatments that purport to change sexual orientation. The statement of the American Psychiatric Association cautions that “[t]he potential risks of ‘reparative therapy’ are great, including depression, anxiety and self-destructive behavior.”[31]

”

The Australian Psychological Society states:

“

Homosexual orientation is not a mental illness and there is no scientific reason to attempt conversion of lesbians or gays to heterosexual orientation. The Australian Psychological Society acknowledges the lack of scientific evidence for the usefulness of conversion therapy, and notes that it can in fact be harmful for the individual. Changing the sexual orientation of a person is not simply a matter of changing the person's sexual behavior. It would require altering the emotional, romantic and sexual feelings of the person and restructuring self-concept and social identity.[32]

”

The Royal College of Psychiatrists has stated in 2009 that it "shares the concern of both the American Psychiatric Association and the American Psychological Association that positions espoused by bodies like the National Association for Research and Therapy of Homosexuality (NARTH) in the United States are not supported by science. There is no sound scientific evidence that sexual orientation can be changed. Furthermore so-called treatments of homosexuality as recommended by NARTH create a setting in which prejudice and discrimination can flourish,"^[33] and added that "The best evidence for efficacy of any treatment comes from randomised clinical trials and no such trial has been carried out in this field."^[34]

United States Surgeon General David Satcher issued a report stating that "there is no valid scientific evidence that sexual orientation can be changed".^[35]

American Psychological Association "encourages mental health professionals to avoid misrepresenting the efficacy of sexual orientation change efforts by promoting or promising change in sexual orientation when providing assistance to individuals distressed by their own or others’ sexual orientation and concludes that the benefits reported by participants in sexual orientation change efforts can be gained through approaches that do not attempt to change sexual orientation".^[36]

[edit] Measuring sexual orientation

Varying definitions and strong social norms about sexuality can make sexual orientation difficult to quantify. Researchers may use different markers of sexual orientation, including self-labeling, sexual behaviour, sexual fantasy or a pattern of erotic arousal. A clinical measurement may use penile or vaginal photoplethysmography, where genital engorgement with blood is measured in response to exposure to different erotic material.^[37] In 1995, two researchers argued that due to a lack of research on change over time, there is a limitation on current conceptualizations of sexual orientation. They did not abandon the concept of sexual orientation, but concluded that "given such significant measurement problems, one could conclude there is serious doubt whether sexual orientation is a valid concept at all," and warned against increasing politicization of this area.^[38]

From at least the late nineteenth century in Europe, there was speculation that the range of human sexual response looked more like a continuum than two or three discrete categories. Berlin sexologist Magnus Hirschfeld published a scheme in 1896 that measured the strength of an individual's sexual desire on two independent 10-point scales, A (homosexual) and B (heterosexual).^[39] A heterosexual individual may be A0, B5; a homosexual individual may be A5, B0; An asexual would be A0, B0; and someone with an intense attraction to both sexes would be A9, B9.

Fifty years later, American sexologist Alfred Kinsey wrote in Sexual Behavior in the Human Male (1948):

Males do not represent two discrete populations, heterosexual and homosexual. The world is not to be divided into sheep and goats. It is a fundamental of taxonomy that nature rarely deals with discrete categories... The living world is a continuum in each and every one of its aspects. While emphasizing the continuity of the gradations between exclusively heterosexual and exclusively homosexual histories, it has seemed desirable to develop some sort of classification which could be based on the relative amounts of heterosexual and homosexual experience or response in each history... An individual may be assigned a position on this scale, for each period in his life.... A seven-point scale comes nearer to showing the many gradations that actually exist.

– ^[40]

The Kinsey scale measures sexual orientation from 0 (exclusively heterosexual) to 6 (exclusively homosexual), with an additional category, X, for those with no sexual attraction to either women or men. Unlike Hirschfeld's scale, the Kinsey scale is one-dimensional. Simon LeVay wrote, "it suggests (although Kinsey did not actually believe this) that every person has the same fixed endowment of sexual energy, which he or she then divides up between same-sex and opposite-sex attraction in a ratio indicative of his or her own sexual orientation."^[41]

[edit] Indirect detection

Scientific studies have found a number of statistical biological differences between gay and straight people, which may result from the same underlying cause as orientation itself. The attempt to detect sexual orientation in social situations is known as gaydar; some studies have found that guesses based on face photos perform better than chance. However, it is very much possible that what people notice in these situations is the femininity of the male, and since a disproportionate number of males who take up the gay identity are feminine, this may seem to work.

[edit] Scientific studies on sexual arousal and sexual orientation

Some researchers who study sexual orientation argue that the concept may not apply similarly to men and women. A study of sexual arousal patterns^[42] found that women, when viewing erotic films which show female-female, male-male and male-female sexual activity (oral sex or penetration), have patterns of arousal which do not match their declared sexual orientation as well as men's. That is, heterosexual and lesbian women's sexual arousal to erotic films do not differ significantly by the gender of the participants (male or female) or by the type of sexual activity (heterosexual or homosexual). On the contrary, men's sexual arousal patterns tend to be more in line with their stated orientation, with heterosexual men showing more penis arousal to female-female sexual activity and less arousal to female-male and male-male sexual stimuli, and homosexual men being more aroused by films depicting male-male intercourse and less aroused by other stimuli.

Another study on men and women's patterns of sexual arousal confirmed^[43] that men and women have different patterns of arousal, independent of their sexual orientation. The study found that women's genitals become aroused to both human and nonhuman stimuli from movies showing humans of both genders having sex (heterosexual and homosexual) and from videos showing non-human primates (bonobos) having sex. Men did not show any sexual arousal to non-human visual stimuli, their arousal patterns being in line with their specific sexual interest (women for heterosexual men and men for homosexual men).

These studies suggest that men and women are different in terms of sexual arousal patterns and that this is also reflected in how their genitals react to sexual stimuli of both genders or even to non-human stimuli. It must be stated that sexual orientation has many dimensions (attractions, behaviour, identity), of which sexual arousal is the only product of sexual attractions which can be measured at present with some degree of precision. Thus, the fact that women are aroused by seeing non-human primates having sex does not mean that women's sexual orientation includes this type of sexual interest. Some researchers argue that women's sexual orientation depends less on their patterns of sexual arousal than men's and that other components of sexual orientation (like emotional attachment) must be taken into account when describing women's sexual orientations. In contrast, men's sexual orientations tend to be primarily focused on the physical component of attractions and, thus, their sexual feelings are more exclusively oriented according to sex.

Studying human sexual arousal has proved a fruitful way of understanding how men and women differ as genders and in terms of sexual orientation. More recently, scientists have started to focus on measuring changes in brain activity related to sexual arousal, by using brain-scanning techniques. Given that sexual feelings are the product of perceptions and/or fantasies which are processed in the brain, measuring brain regions activity should further show how people of different sexual orientations differ in this respect.

A study on how heterosexual and homosexual men's brains react to seeing naked pictures of men and women has found^[44] that both hetero- and homosexual men react positively to seeing their preferred sex, using the same brain regions. The only significant group difference between these orientations was found in the amygdala, a brain region known to be involved in regulating fear.^[45]

Although these findings have contributed to understanding how sexual arousal can differentiate between genders and sexual orientations, it is still a matter of debate whether these results reflect differences which are the result of social learning or genetic and/or biological factors. Further studies are needed to clarify how much of people's reactions to sexual stimuli of their preferred gender are due to learned or innate factors.

[edit] Demographics of sexual orientation

The multiple aspects of sexual orientation and the boundary-drawing problems already described create methodological challenges for the study of the demographics of sexual orientation. Determining the frequency of various sexual orientations in real-world populations is difficult and controversial.

In the oft-cited and oft-criticized Sexual Behavior in the Human Male (1948) and Sexual Behavior in the Human Female (1953), by Alfred C. Kinsey et al., people were asked to rate themselves on a scale from completely heterosexual to completely homosexual. Kinsey reported that when the individuals' behavior as well as their identity are analyzed, most people appeared to be at least somewhat bisexual – i.e., most people have some attraction to either sex, although usually one sex is preferred. According to Kinsey, only a minority (5-10%) can be considered fully heterosexual or homosexual. Conversely, only an even smaller minority can be considered fully bisexual (with an equal attraction to both sexes).

Kinsey's methods have been criticized as flawed, particularly with regard to the randomness of his sample population, which included a large number of prison inmates. Nevertheless, Paul Gebhard, subsequent director of the Kinsey Institute for Sex Research, reexamined the data in the Kinsey Reports and concluded that accounting for major statistical objections barely affected the results. Most modern scientific surveys find that the majority of people report a mostly heterosexual orientation. However, the relative percentage of the population that reports a homosexual orientation varies with differing methodologies and selection criteria. Most of these statistical findings are in the range of 2.8 to 9% of males, and 1 to 5% of females for the United States^[46] — this figure can be as high as 12% for some large cities and as low as 1% percent for rural areas). In gay villages such as The Castro in San Francisco, California, the concentration of self-identified homosexual people can exceed 40%.^{[citation needed]}

Estimates for the percentage of the population that are bisexual vary widely, at least in part due to differing definitions of bisexuality. Some studies only consider a person bisexual if they are nearly equally attracted to both sexes, and others consider a person bisexual if they are at all attracted to the same sex (for otherwise mostly heterosexual persons) or to the opposite sex (for otherwise mostly homosexual persons). A small percentage of people are not sexually attracted to anyone (asexuality).

[edit] Influences on sexual orientation

The American Psychological Association, the American Psychiatric Association, and the National Association of Social Workers state:

“

Currently, there is no scientific consensus about the specific factors that cause an individual to become heterosexual, homosexual, or bisexual — including possible biological, psychological, or social effects of the parents’ sexual orientation. However, the available evidence indicates that the vast majority of lesbian and gay adults were raised by heterosexual parents and the vast majority of children raised by lesbian and gay parents eventually grow up to be heterosexual.[31]

”

The Royal College of Psychiatrists states:

“

Despite almost a century of psychoanalytic and psychological speculation, there is no substantive evidence to support the suggestion that the nature of parenting or early childhood experiences play any role in the formation of a person’s fundamental heterosexual or homosexual orientation. It would appear that sexual orientation is biological in nature, determined by a complex interplay of genetic factors and the early uterine environment. Sexual orientation is therefore not a choice.[47]

”

The American Academy of Pediatrics states:

“

The mechanisms for the development of a particular sexual orientation remain unclear, but the current literature and most scholars in the field state that one’s sexual orientation is not a choice; that is, individuals do not choose to be homosexual or heterosexual. A variety of theories about the influences on sexual orientation have been proposed. Sexual orientation probably is not determined by any one factor but by a combination of genetic, hormonal, and environmental influences. In recent decades, biologically based theories have been favored by experts. Although there continues to be controversy and uncertainty as to the genesis of the variety of human sexual orientations, there is no scientific evidence that abnormal parenting, sexual abuse, or other adverse life events influence sexual orientation. Current knowledge suggests that sexual orientation is usually established during early childhood.[48]

”

Professor Michael King states: "The conclusion reached by scientists who have investigated the origins and stability of sexual orientation is that it is a human characteristic that is formed early in life, and is resistant to change. Scientific evidence on the origins of homosexuality is considered relevant to theological and social debate because it undermines suggestions that sexual orientation is a choice."^[49]

Debate continues over what biological and/or psychological variables influence sexual orientation in humans, such as genes and the exposure of certain levels of hormones to fetuses. Freud and other psychoanalysts maintain that sexual orientation is influenced by numerous factors including formative childhood experiences in some cases.

[edit] Environmental factors

[edit] Prenatal hormones on developing fetus

The hormonal theory of sexuality holds that, just as exposure to certain hormones plays a role in fetal sex differentiation, such exposure also influences the sexual orientation that emerges later in the adult. Fetal hormones may be seen as either the primary influence upon adult sexual orientation, or as co-factor interacting with genes and/or environmental and social conditions^[50].

[edit] Birth order

Recent studies found an increased chance of homosexuality in men whose mothers previously carried to term many male children. This effect is nullified if the man is left-handed.^[51] No similar effect was found in women.^{[citation needed]}

[edit] Genetic factors

Research has identified several biological factors which may be related to the development of sexual orientation, including genes, prenatal hormones, and brain structure. No single controlling cause has been identified, and research is continuing in this area. At one time, twin studies appeared to point to a major genetic component, but problems in experimental design of the available studies have made their interpretation difficult, and one recent study appears to exclude genes as a major factor.^[52]

[edit] Innate bisexuality

Innate bisexuality, or predisposition to bisexuality, is an idea introduced by Sigmund Freud, based on work by his associate Wilhelm Fliess. According to this theory, all humans are born bisexual but through psychological development, which includes both external and internal factors, become monosexual while the bisexuality remains in a latent state.

[edit] Sexual orientation as a social construct

Because sexual orientation is complex and multi-dimensional, some academics and researchers, especially in Queer studies, have argued that it is a historical and social construction. In 1976 the historian Michel Foucault argued that homosexuality as an identity did not exist in the eighteenth century; that people instead spoke of "sodomy", which referred to sexual acts. Sodomy was a crime that was often ignored but sometimes punished severely (see sodomy law).

Foucault further argued that it was in the nineteenth century that homosexuality came into existence as practitioners of emerging sciences and arts sought to classify and analyze different forms of sexuality. Finally, Foucault argues that it was this emerging discourse that allowed some to claim homosexuality as a human identity.^{[citation needed]}

Heterosexuality and homosexuality are terms often used in European and American cultures to encompass a person’s entire social identity, which includes self and personality. In Western cultures some people speak meaningfully of gay, lesbian, and bisexual identities and communities. In other cultures, homosexuality and heterosexual labels don’t emphasize an entire social identity or indicate community affiliation based on sexual orientation.^[53]

Some historians and researchers argue that the emotional and affectionate activities associated with sexual-orientation terms such as gay and straight change significantly over time and across cultural boundaries. For example, in many English-speaking nations it is assumed that same-sex kissing, particularly between men, is a sign of homosexuality, whereas various types of same-sex kissing are common expressions of friendship in other nations. Also, many modern and historic cultures have formal ceremonies expressing long-term commitment between same-sex friends, even though homosexuality itself is taboo within the culture.^[54]

[edit] Perceived sexual orientation

One person may assume knowledge of another person's sexual orientation based upon perceived characteristics such as appearance, clothing, and tone of voice. Perceived sexual orientation may affect how a person is treated. For instance, in the United States, the FBI reported that 15.6% of hate crimes reported to police in 2004 were "because of a sexual-orientation bias."^[55]

Under the UK Employment Equality Regulations, "workers or job applicants must not be treated less favorably because of their sexual orientation, their perceived sexual orientation or because they associate with someone of a particular sexual orientation."^[56]

[edit] Medical associations with policy related to sexual orientation

[edit] Australia

• Australian Medical Association[3]

[edit] China

• Chinese Society of Psychiatry

[edit] United States

• American Academy of Pediatrics [4]
• American Medical Association[5]
• American Medical Student Association [6]
• American Psychological Association (for public)[7] (for educators)[8]
• Catholic Medical Association^[57]
• Christian Medical and Dental Association [9]

[edit] See also

• Affectional orientation
• Ascribed characteristics
• Hate crime
• LGBT (Lesbian, Gay, Bisexual, and Transgender)
• List of anti-discrimination acts
• LGBT rights by country or territory
• Human male sexuality, including non-western perspectives on sexual orientation
• Same-sex marriage
• Sexual orientation and military service
• Terminology of homosexuality

[edit] References

[edit] Further reading

• Anders Agmo Functional and dysfunctional sexual behavior Elsevier 2007
• De La Torre, Miguel A., "Out of the Shadows, Into the Light: Christianity and Homosexuality" Chalice Press, 2009.
• Dynes, Wayne (ed.) "Encyclopedia of Homosexuality." New York and London, Garland Publishing, 1990.
• Gil Brum, Larry McKane, and Gerry Karp. Biology – Exploring Life, 2nd edition. John Wiley & Sons, Inc. 1994. p. 663. (About INAH-3.)
• Sell, Randall L. (December 1997). Defining and measuring sexual orientation: a review. Archives of Sexual Behavior 26(6) 643-658. (excerpt)
• Serge Wunsch PhD thesis about sexual behavior Paris Sorbonne 2007

[edit] External links

• Sexual Orientation Video

Wikiquote has a collection of quotations related to: Sexual orientation

• "The H-Word" by Paul Niquette
• A law lecture (mp3) on sexual orientation and U.S. constitutional law
• American Psychological Association: Answers to Your Questions About Sexual Orientation and Homosexuality
• Aspirin changes sexual behaviour of rats
• Brain gender: prostaglandins have their say
• Loraine JA, Ismail AA, Adamopoulos DA, Dove GA (November 1970). "Endocrine function in male and female homosexuals". Br Med J 4 (5732): 406–9. PMID 5481520. 
• Etiology on glbtq.com
• Magnus Hirschfeld Archive of Sexology at the Humboldt University in Berlin
• Is sexual orientation determined at birth?
• Sanders BK (2007). "Sex, drugs and sports: prostaglandins, epitestosterone and sexual development". Med. Hypotheses 69 (4): 829–35. doi:10.1016/j.mehy.2006.12.058. PMID 17382481. 
• Survivor bashing - bias motivated hate crimes
• The Science Of Sexual Orientation
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