Non-monogamy Information & Non-monogamy Links at HealthHaven.com

The Purple Mobius symbol for Polyamory, non-monogamy, and LGBTQ.

The "love outside the box" symbol for Polyamory, non-monogamy, and LGBTQ.

Nonmonogamy is a blanket term covering several different types of interpersonal relationships in which some or all participants have multiple marital, sexual, and/or romantic partners. This can be contrasted with its opposite, monogamy, and yet may arise from the same psychology. The term has been criticized as it implies that monogamy is the norm and that any other way of relating is somehow a deviation of that norm.

Forms of nonmonogamy include:

casual relationship a physical and emotional relationship between two unmarried people who may have a sexual relationship
group marriage (also termed polygynandry), in which several people form a single family unit, with all considered to be married to one another
group sex and orgies involving more than two participants at the same time
infidelity, such as an affair, in which one or more participants fails to comply with expectations of monogamy in a relationship.
Line families, a form of group marriage intended to outlive its original members by ongoing addition of new spouses
ménage à trois, a sexual (or sometimes domestic) arrangement involving three people
polyamory, in which participants have multiple romantic partners
PolyFamilies, similar to group marriage, but some members may not consider themselves married to all other members
polyfidelity, in which participants have multiple partners but restrict sexual activity to within a certain group
polygamy, in which one person in a relationship has multiple partners

polyandry, in which women have multiple husbands
polygyny, in which men have multiple wives
plural marriage, a form of polygyny associated with the Latter-day Saints movement in the 19th-century and with present-day splinter groups from that faith. It is also associated with an evangelical splinter group which advocates Christian Plural Marriage

open marriage and open relationships, in which one or both members of a committed couple may become sexually active with other partners
swinging, similar to open relationships, but commonly conducted as an organised social activity

As can be seen from this list, the Greek prefix 'poly-' (meaning 'many') is often used in naming nonmonogamous forms of relationship. In informal use such names are sometimes abbreviated to just 'poly', with the rest indicated by context.

Many nonmonogamous terms are flexible in definition, because they are based on criteria such as 'relationship' or 'love' that are themselves variably defined; see discussions at their respective pages for more detail on individual forms. In addition, usage creates distinctions beyond the raw definitions of the words. Thus, even though some relationships might technically be considered both polygamous and polyamorous, 'polygamy' usually signifies a codified form of multiple marriage, based on established religious teachings, while 'polyamory' is based on the preferences of the participants rather than social custom or established precedent.

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