The guy's wife is great - you can't get bored with her. Her pussy is very popular among the people. Husband loves eggs, so he tastes other people's sperm for breakfast. Why, it's pretty much the same thing! Lovers come and go, but the husband stays. It's not like this wife is going to work somewhere-she's not a prostitute, to take money for that. For her, standing up is a pleasure, not a job!
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.