Mouths to Pleasure, Pussies to Enjoy (France 1982)

Claire Lenoir and a thin girl with short dark hair (Patricia) are peeping tomettes. They spy on people having sex in neighbouring apartment blocks using binoculars and masturbate or have lesbian sex while doing so. Two detectives, André Kay and Sylvio Ray, are sent by their boss (Ghislain Garet) to investigate. They got to Clair's apartment. she isn't there, but they find the maid (Josiane Beongura) having sex with a man and spy on her. Then they and the maid spy on the man having anal sex with another woman (face unseen). The two men then have sex with the maid. Later all three detectives go to the apartment and try to have sex with Clair Lenoir, but her friend comes in with a gun. Then the two girls have their way with the men. They send the maid out and she returns dressed as a male Arab and the girls force the men to submit to being sucked off by 'him'. Then they reveal the deception and the friend goes off into another room with the boss detective and has sex with him and the others have a foursome in which the maid gets a DP.