Excitation au soleil 1978 Directed by Michel Lemoine
A couple awaits for the arrival of their friend and his new fiancee. An attractive woman with long blonde hair shows up and they assume it's her. The woman has the idea to start screwing everyone in sight. Then when the actual fiancee shows up they assume that she is the hired help and is treated as such. By the time their buddy arrives everyone has pretty much banged everyone else.
