Une partie de plaisir (A Piece of Pleasure) is a 1975 French film directed by Claude Chabrol and starring its screenwriter and longtime Chabrol collaborator Paul Gégauff. In the film, Gégauff plays a writer with a troubled marriage that ends in tragedy. (In 1983, Gégauff was stabbed to death in real life by his second wife.) In this film, his wife is played by his real-life first wife Danièle Gégauff (already divorced when this film was made) and his daughter is played by real life daughter Clemence Gégauff.
Philippe and Ester are happily married and living a middle class life with their young daughter. In order to add excitement and sophistication to the marriage, Philippe suggests they begin sleeping with other people then describing it to each other. But Philippe becomes filled with jealously and anger towards his wife until tragedy destroys the entire family.