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.
Hot girl! You could fuck her for hours, I'd fuck her in the pussy all day long! She'd bounce on my dick, give me a good blowjob, and then go crazy with all the sperm she's got!)