Cuck

Cuck is a shortened form of cuckold. As a kink, it describes a person who finds sexual pleasure in watching or knowing that their partner is having sex with someone else, often with an element of consensual humiliation or voyeurism. It appears across straight, gay, and queer relationships and, when practiced, rests on communication and consent like other BDSM interests. The word cuckold is centuries old in English and traces to the cuckoo bird, which lays its eggs in other birds' nests. In recent internet and political culture, cuck has also been used as a misogynistic and homophobic insult, a meaning separate from the consensual kink.