A Little Sex In The Night(1977)

Charlie Schreiner plays the nephew of Richard and Liliane Lemieuvre. He is very inexperienced sexually and arrives to find the maid, Fabrette, lying on the kitchen floor covered with uncooked spaghetti and masturbating. He is too keen on studying to be interested in women but Martine eventually manages to arouse him. And when she does it won't go down. A doctor is called (Christine Chireix) who gives him 'suction' but he's still erect. Meanwhile, Veronique and Bernard Hug have sneaked into the house for no apparent reason and have a threesome with Martine. Martine and Veronique both have their way with Charlie who is still erect. The Lemievres are about to divorce and Liliane is frustrated as Richard is not interested in sex. Richard picks up Marilyn, a hitchhiker (Francoise Avril), and she tries Charlie and Richard at the same time. Charlie then has a foursome with Martine, Veronique, and the doctor. Liliane relieves her frustrations with Bernard and finally, there is a free for all.