Gérard and Françoise, a couple in their fifties, are enjoying a short holiday on the Mediterranean coast. There they meet a young woman named Fred and her boyfriend Mathieu. The younger couple lives their sexuality freely and enjoys it to the fullest – and they change Gérard and Françoise's perspective on their own love lives: they have their first experiences with voyeurism, and eventually succumb to the temptation of swinging. But this sexual escape comes at a price...