2 definitions by Osiris2

Sociosexual orientation (or sociosexuality) is the individual difference in the willingness to engage in sexual activity outside of a committed relationship. Individuals with a more restricted sociosexual orientation are less willing to engage in casual sex; they prefer greater love, commitment and emotional closeness before having sex with romantic partners. Individuals who have a more unrestricted sociosexual orientation are more willing to have casual sex and are more comfortable engaging in sex without love, commitment or closeness.

This is a rather new term I think, 2014 being the first time I have encountered it. Sociosexuality is a psychological or clinical term for promiscuity, or the degree of it, i.e. high or low.
"Sally is highly sociosexual."

"For fucks sake dude; she's a slut. Bigtime!"
by Osiris2 February 20, 2014
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Cuckold historically referred to a husband with an adulterous wife and is still often used with this meaning.

In evolutionary biology, the term cuckold is also applied to males who are unwittingly investing parental effort in offspring that are not genetically their own.

Since the 1990s, the term has also been widely used to refer to a sexual fetish in which the fetishist is stimulated by their committed partner choosing to have sex with someone else.
Sally is fucking everyone, and her chuckold husband Dave is OK with it.

Larry is a chuckold and he is clueless.
by Osiris2 February 20, 2014
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