My Nights with Susan Sandra Olga & Julie (1975) (1975)
Susan (Willeke Van Ammelrooy) lives on an idyllic farmhouse, along with the sex-loving youngsters Sandra, Olga and Julie, and the unstable voyeur Albert. A number of absurd killings take place by the sex-vampires. The allegations, however, go out to Piet (Nelly Frijda), the crazy woman on the other side of the ditch. A young craftsman is surprised by the dangerous ladies.