Derrière le miroir sans tain

Also known as Mädchen im Spiegel der Lust, Désirs de femmes, Behind the 2 Way Mirror

Sam is an author. His publisher wants him to write an erotic book. Unfortunately he has no imagination. To get some stimulation he watches a porn video together with his wife Agnes. Agnes's girlfriend Francoise joins them and describes an amorous adventure she has experienced recently...