Slippery When Wet (1976)

Ellen, Stella and Kate are friends from college, who still see each other. Kate, who's married, sleeps with Ellen's husband Don behind her back and Ellen, once a promising figure skater, is becoming more and more frigid. Stella is an artists, who draws erotic art. Her latest erotic model is Chris Knowles, a dominant, sly, charismatic, highly self-assured, assertive and even aggressive Southern girl with a somewhat of an agenda of her own. She begins playing games and seducing coy Stella and her friends with the help of her hunky silent submissive nice brother Dougie Knowles and another male model. She even seduces Stella's uptight ex-husband's sister. All that sex brings out hidden passions in all of them. Stella begins falling for Dougie, Chris' gives in to her incestuous urges for once, Ellen begins enjoying sex again and Kate realizes she's actually deeply in love with Ellen and confess her feelings for her. Chris also introduces the girls to a new way of using a salami.