Nicolas and Valerie live together in a harmonious relationship, in which they frequent swingers clubs. While having dinner with two other couples, Valerie asks them to join her and Nicolas in this sexual practice. Charles and Luc like the idea, but Veronique and Lisa, not so much.
Nevertheless, the six friends agree to go to the club, where Veronique, who has already secretly cheated on Charles, takes part in the experience. But Charles balks at the sight of her in another man’s arms. Meanwhile, shy and reticent Lisa takes no pleasure in the goings-on, contrary to Luc, who enjoys indulging his Peeping Tom fantasies.