Marlène, a young woman who has just arrived in Paris, meets a boy with homosexual tendencies, who during their first night of love behaves in a sadistic way. At first shocked by this attitude, she took a liking to it very quickly. From then on, in all of her adventures, she will always go further into masochism, forcing her partners to endlessly mortify her, alone or in a group. A real madness has seized her, which will lead her to the most extreme perversions.

After moving from their native Sweden to Paris, Ingrid and Ulla try to find work as au pair girls. They are quickly hired for a different type of personal service.

Eva is a young innocent Dutch girl who is in love with Antoine, brother of her best friend Martine. When she accidentally see her and her husband Henri having sex, they invite her to join a threesome. But Antoine comes unexpectedly and sees her betrayal. He punishes both her and his sister. To try on lovers, friends have a masquerade party.