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.
Beach season is in full swing and risk is a noble thing, a couple in love did not do anything wrong, they just fucked passionately for fun on the beach. Sometimes it is necessary to change the environment, or at home or in a hotel room, sex is already bored and not interesting. Good thing that there were no other tourists nearby and the young couple was able to enjoy themselves to the fullest.