François Giroux and Isabelle Robert want a modern and open-minded couples. At 50, François leads a small film company and Isabelle, 35, is a writer beginner. After their marriage, they struggle against all the taboos and values they consider obsolete. They want to live as a young twenty years but face enormous difficulties doing it and always end up falling back into their old lifestyle. In reality they are much more conservative do they want to admit it.