Every man sooner or later wants to stick his dick in a chick's anus. And once he's tried it, he'll never give it up. You see, the guy even licks the girls' asshole to turn them on and aggravate their sensations. Of course, alternating the plunge of his bolt between the asshole and the mouth causes a buzz and a languor in the balls. And there and there you want to insert as deeply as possible. So bitches who give in the ass are most in demand by the male half of society. So I'm FOR that kind of fun between lovers.
Watching your wife suck other people's dicks is a buzz kill. And she understands that by licking other people's testicles, her husband's boner will get sharper. So these swinger couples swap to sharpen their senses, bring back the novelty, and make their orgasms brighter. Only I would make the lighting not so bright, then there would be more understatement and less embarrassment.
What's the assignment for info?