Three young couples are renovating together a loft in Paris. During a barbecue, they confess to their friends that they practice partner-swapping. That information shocks one of the couples, but the other one seems to be interested.
Alain, a real estate agent, is invited with his girlfriend to one of the erotic evenings of his boss, Philippe. The young employee knows well that the last of these sexual games almost ended badly, but his curiosity pushes him to accept.
James announces to his friends, Mario and Mylène, that he will soon marry Fany. Judging his future wife too prude, they decide to test his loyalty and bring back his ex-girlfriend, Oriane in his life. She soon disturbs the future husband.
Philippe wants to move. After having visited several apartments, he ends up finding what he is looking for. But the attractive Blandine is also interested in accommodation. She then uses her charms to accept a collocation.
Playboy Lucas has multiple lovers. There's current favorite Loren and Jessica and old favorite Emma. Emma decides to groom Loren into a lady with fine qualities which Lucas is looking for.
Aline's boyfriend Arnaud is unwilling to commit exclusively to her. He would like to know several women before committing to Aline in matrimony. In an attempt to save their love, Aline arranges a few love-making encounters for him.
Rachel, who only trusts her roommate Amanda, is suspicious of her secretary, Carole whom she suspects of illicit contacts with the competition. Rachel and Angela follow Carole to a secret meeting but finds her at a harmless voyeur's party.
