Cheating Couples (1977)

Monsieur Libert, has an eye on Chantal, wife of Jacques, one of his staff. So he gives him a good promotion and the next day, they go to Paris together. First, the boss organizes some breakfast on the rue Chazelles where they are received by blonde girl Erika. The place is obviously a brothel and Jacques, still worried about being away from his wife has it off with Erika as his boss has threesome with Danièle and a young African woman. Later, the boss organizes another sex party which Chantal joins, but only watches. The boss phones Chantal and invites her out for the evening. He leaves out Jacques in Paris with some business to do and returns. He has a good time with Erica and Chantal, but his wife and Jacques come and get involved in the situation.