The Kinky Ladies of Bourbon Street(1976)

Original title: Mes nuits avec... Alice, Pénélope, Arnold, Maud et Richard

Following failed suicide attempts, three professional women wind up sharing a hospital room where the mysterious Maude (Dutch Trixie Heinen) comes to visit, making them an offer they can't refuse, to join her at her palatial mansion where they can "love" themselves to death.