Hot Bodies(1983)

Original title: Ardeurs perverses

Roland, a handsome forty-year old businessman, is quite fond of his lovely wife, Doris - but that doesn't stop him from taking advantage of the lovely young girls who are always attracted to him. Not that Doris isn't open minded, however - after seeing an erotic movie with her husband, the couple ends up going with a lovely young woman and engaging in a torrid threeway affair. But this erotic interlude leaves Doris with a bad taste, and she gives Roland the perfect opportunity to bring home all the girls he's ever wanted; and Doris gets a chance to live it up with Didier and his best friend.