Sexual fidelity

thumb|Illustration depicting an adulterous wife, circa 1800

Monogamy ( ) is a relationship of two individuals in which they form a mutual and exclusive intimate partnership. Having only one partner at any one time, whether for life or serial monogamy, contrasts with various forms of non-monogamy (e.g., polygamy or polyamory).

sexual behavior involving more than two participants

alt=In a painting, a naked woman reclines on a bed. Her gaze is averted from a muscular, bearded, older man, who gestures decisively. A naked man reclines beside the woman, holding her protectively.|thumb|Venus (goddess)|Venus and Mars Surprised by Vulcan, by [[Alessandro Varotari. In ancient Roman religion, Vulcan discovers his wife, Venus, having an affair with Mars.]]

Polyamory () is the practice or support of, maintaining committed, romantic, and/or sexual relationships with more than one partner, in parallel or concurrently, with the consent of all involved partners. Polyamory allows for ethical-non-monogamy (ENM) which is a subset of the broader consensual non-monogamy. Many people who identify as polyamorous believe in a conscious management of jealousy and reject the view that sexual and relational exclusivity (monogamy) are prerequisites for deep, committed, long-term, loving relationships. When members of a closed polyamorous relationship restrict th

group sexual practice

romantic relationship involving three people

interpersonal relationship to form of a non-monogamous relationship

Iranian citizen sentenced to stoning

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three or more adults in a partnership

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violent crime which is done because of sudden strong impulse such as sudden rage

form of non-monogamy

belief that relationships should be unbound by rules except those with a mutual agreement

thumb|The Father-in-Law, a 1888 painting by Vladimir Makovsky Traditional practice until the beginning of the 20th century"In Russia during the second half of the 19th and early 20th centuries, snokhachestvo was a rather widespread type of sexual crime. [...] With the modernization taking place in Russia during this time, the countryside witnessed: the disintegration of large patriarchal families into small nuclear families, and the gradual transition of the majority of the peasantry from the traditional sphere of customary law to the official normative one. This led to significant emancipatio

thumb|upright=1.35 |Depiction of many types of non-monogamy and how they overlap

trial by ordeal administered to the wife whose husband suspected her of adultery but who had no witnesses to make a formal case

Polyfidelity is a type of non-monogamous relationship in which all members are recognized as equivalent to the other partners and comply to restrict sexual and romantic relationship activities to exclusively only other members within the group.

A cuckquean is the wife of an adulterous husband (or partner for unmarried companions), and the gender-opposite of a cuckold. In evolutionary biology, the term is also applied to females who are investing parental effort in offspring that are not genetically their own. Similar prying within a family is called wittoldry. The term is derived from Early Modern English dating back to 1562 and is composed of the terms cuck "someone whose partner is unfaithful" and quean ().

psychological concept

multiple sexual relationships with mutual consent outside a single marriage