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.
This female has every part of her body sharpened for jerking off her dick. She's good at rolling balls in her mouth, too. She's a virtuoso chick! We should have her in the barracks.