Simon and Babeth seem to be a happy couple, but she is not very interested in sex, while he is the opposite. He dated his secretary, his elderly neighbor downstairs, his friend Victoria, and other mistresses. But Babeth began to suspect and followed Simon to a hotel where Simon booked a room for a date with one of his mistresses. Babeth excites her by booking adjoining rooms and trying to keep an eye on them. Babeth, with the help of her friend Victoria, persuades her to make some changes. First he takes her to the Boulogne Forest to see what's going on, then they join é changiste, a club run by France Lomay, and take part in several revelry, finally one of their own.