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.
Skinny lady, but surprisingly very good at fucking in the anus! I never would have thought it was possible to get such pleasure from sex with a petite lady, I'll have to try it myself with such a lady!