Couple 'libéré' cherche compagne 'libérée' (1982)

The tender, malicious, audacious and perverted story of a young unmarried couple, Alex, an erotic novel writer and Dorothee who grow closer and whose sex-lives grow more intense when they decide to spice up their relationship by seeking out prospective participants for their wild sex games. For this they get married to find sex partners more easily.