Consensual non-monogamy (CNM), and its subset ethical non-monogamy (ENM), are the practice of non-monogamous intimate or sexual relations that are distinguished from infidelity by the knowledge and consent of those involved, and from polygamy by the various partners not being in a single marriage. Forms of consensual non-monogamy include

swinging Swing or swinging may refer to: Apparatus * Swing (seat), a hanging seat that swings back and forth * Pendulum, an object that swings * Russian swing, a swing-like circus apparatus * Sex swing, a type of harness for sexual intercourse * Swing rid ...

, polyamory,

open relationships An open relationship is an intimate relationship that is sexually non-monogamous. The term is distinct from polyamory, in that it generally indicates a relationship where there is a primary emotional and intimate relationship between two partners ...

, cuckquean fetishism and cuckolding fetishism. Consensual non-monogamy can take many different forms, depending on the needs and preferences of the individuals involved in specific relationships. As of 2019, over one fifth of the United States population has, at some point in their lives, engaged in some sort of consensual non-monogamy. It is common for swinging and open couples to maintain

emotional Emotions are mental states brought on by neurophysiological changes, variously associated with thoughts, feelings, behavioral responses, and a degree of pleasure or displeasure. There is currently no scientific consensus on a definition. E ...

monogamy while engaging in extra-dyadic sexual relations. Swinging: Pushing the Boundaries of Monogamy? Similarly, the friend/partner boundary in forms of consensual non-monogamy other than polyamory is typically fairly clear. Unlike other forms of non-monogamy, though, "polyamory is notable for privileging emotional intimacy with others." Polyamory is distinguished from some other forms of ethical non-monogamy in that the relationships involved are loving intimate relationships, as opposed to purely sexual relationships.

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