As
@Greyrock said, there's no one psychology to this kink. Most of the interest in it can boil down to two elements however:
- The relationship
- The scenario
The relationship is generally the
interesting part. Cuckolding and cuckqueening play with the taboo of monogamy; someone in the relationship (or maybe just the reader) is usually getting off on the idea of
cheating, because there's a taboo violation there. That can play into lots of other taboos like unusual power-relationships (guy as powerless to stop his wife from cheating, wife is powerless to not sleep with men her husband orders her to, etc.), and there's often a social factor where it isn't always the sex that's the problem but if someone
finds out about the sex. It can play on factors of inadequacy in and out of the bedroom, emotional or physical needs not being met, and it can disrupt "stable" relationships by introducing a third party that upsets the equilibrium - and the person or persons that are involved in the extramarital relationship can be a significant factor too. We normally think of couples as being heterosexual and pursuing someone of the opposite sex, but that doesn't have to be true - a woman can cuckold a man by taking a female lover, a husband can cuck his wife by being seduced by another dude, etc.
The scenario is usually where added kinks come in - taboo pile-on. Basic scenarios are something on the order of "Our sex life is boring, so we decided to try an open marriage" or "We want to have a baby but I shoot blanks" - or sometimes with the addition of another fetish "My husband is a voyeur and can only really get off by hiding in the closet and watching as I have sex" or "I wanted another baby, my husband shoots blanks, but my 19-year-old son is living with us so we decided he'd be a good sperm donor" etc. etc.
The scenario often provides both an initial inspiration for the cuckolding to happen, and a framework within which it plays out. If the purpose is babymaking, for example, then the question is
is it successful, and the question after that is
but does that spell the end of the relationship? Because once you set up the imbalance of someone else fucking your wife/husband, that can create trust issues inside the relationship...and here are a lot of different ways that can go. Maybe the cuckolding continues on, maybe a menage a trois develops, maybe that really was the end and the couple realize that they love each other and don't want to fuck anyone else, or maybe the relationship completely breaks down and they get divorced. The key point is less
how it ends than
how everyone feels while it's going on. It's a different story if someone likes their wife to be a slut than if they're devastated by the news.