Bad Girls IV (1986)

Jamie Hunt is a notorious lothario who's set out to break the world record by having sex with 15,000 women in just three years. Everything is going smoothly until a trio of delectable damsels move into his apartment building. His roommates John and Harry try to keep him focused on his goal, but Jamie's fallen head over heels for the delightful charms of Sandy. But just as Jamie's getting ready to seal the deal with the luscious lust bunny, Sandy catches a TV report about his sexual endeavors. She decides to get back at him in the best way she can think of -- by favoring someone else with her naturally delicious charms.