My Nights with Susan, Olga, Albert, Julie, Piet & Sandra

In this 1975 Dutch erotic thriller film, a woman named Susan lives a secluded life on a dilapidated farm with her eccentric housemates, including sex-crazed young women and an unstable voyeur. When Anton, a hunky courier, arrives to pick up Susan for a job, he becomes fascinated by the household's chaotic dynamics and decides to stay - but his presence sets off a chain of events that descends into madness, murder, and sexual obsession.