Wicked Schoolgirls (1981)

The sexual misadventures of several amorous adolescents. Giggles gets blackmailed by the sleazy Willie, who has several photos of her in compromising positions. Giggles' older brother Jock decides to help his sister by convincing his girlfriend Joanie to take care of Willie. Meanwhile, lascivious strumpet Velvet gets a job working for a pervert.