Movies like The Party at Kitty and Stud's

The sex life of Stud and his girlfriend Kitty, a young New York City woman. He is brutal and oafish but she is enamored with his sexual performance. They sometimes engage in light sadomasochism, with Stud belt-whipping her. He later posts a sign on a bulletin board inviting people to a party. Several people show up at their apartment and they engage in group sex, with Stud servicing all the women.