Oooh, DB, this is a very fun topic.

For those with whom this is a fetish, playing out this fantasy or desire can be thrilling and satisfying in ways other's who don't share this kink may not understand. And thus, it is like all fetishes, to each our own.

Note: to enact the fantasy, the participants need not be married.

A mistress may designate one of her subs or lovers as the stud for the scene and the other as "he who must watch or service" the couple.

One of my male sub friends has participated in this type of play and was used to ensure the male or males was/were hard for the female - use your imagination here - and that the female was ready for the male(s).

To the sub desiring this type of treatment, humilation and taunting may also be a huge turn on. To be "forced" into the role of watcher, servicer, participater, without being able to have intercourse with the mistress can fulfill the sub's fantasy of being used and/or degraded.

There was a men's magazine that featured a "domination and discipline" section in its readers' letters. This topic and many ways that a male had been "forced" to watch his wife with another man or men, and then be "forced" to participate under her or her lover(s) direction were often quite hot to read.