Jenny Arasse

Mathias, in his forties, abandoned his engineering career to lead a freer life. He is a junk dealer and shares Sandra's existence, a woman younger than him. One day his son Michel and his girlfriend Odile come home and settle down for a while. Attracted by Mathias, Odile multiplies the advances towards her. (Telerama)

A young bank officer ogles the girls in his office and goes home to his prim wife. After reading a book of erotic poems by Guillaume Appollinaire of the World War I era, he finds himself inside the adventures of the book, which are largely of an erotic nature (imdb).