The story typically revolves around a bored or stagnant bourgeois couple. To reignite the spark in their marriage, or simply to indulge in their decadence, they invite a third party—a "Mistress"—into their lives. The film explores the resulting power dynamics, jealousy, and eventual acceptance of a non-monogamous lifestyle.
The film is anchored by high-profile performers of the "Golden Age" of French erotic cinema: Maîtresse pour couple (1980) - IMDb maitresse pour couple 1980 french classic best