Isabelle, a shy single woman, has not had sex for a year. When her best friend offers her the chance to sleep with her husband, she refuses. A 50-year-old man tries to seduce his new, young, neighbor, who confides him him that she's looking for adventure. Beset by uncontrollable desires, an older woman tells her husband she's leaving him because she doesn't want to cheat. Amelie hesitates when her best friend Boris, who's burning with desire for her, asks her to spend one night with him in an attempt to end his obsession. Amelie asks her girlfriend Isabelle to take her place during the rendezvous with Boris, which is to be held in a dark hotel room. When his girlfriend tells him that several days ago, she slept with a colleague who's leaving for Brazil, a young man claims he also had a fling that very same evening.