Depraved! (1967)

Three New York swingers couples, Bob and Polly, Rod and Linda, Vera and Mark, experiment with drugs, swapping mates, and homosexuality. Vera is a bisexual who learns that she's pregnant but does not know who the father is and finds solace with a lesbian friend. Linda cheats on Rod with his brother-in-law, while Polly is a lesbian in denial whom attends transvestite parties to escape from being around her misogynistic husband Bob.