You should exchange wives to refresh your emotions, to feel macho. And wives, in fact, it's nice to be able to feel other men's dicks getting up on her. The video is great - everything is real, with real wives. The younger one was even spanked in the ass. And popularity acts as an aphrodisiac on any woman. The instinct to spread her legs and give - is inherent in the nature of chicks.
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.