Hot Pursuit (1983)

A young innocent-looking singer, Little Miss Shirley, makes one top hit after another. Her strict manager urges her not to do anything that could damage her image. She finds herself in an extremely difficult situation because she once worked on an amateur sex movie hidden somewhere. Desperately, she hires a private investigator to track down the film. He soon finds out that it must be hidden in one of the many mattresses in the Yab Yum. Her escapades yield various sex scenes; one in which she is sucked underwater and cums and an SM scene with a man in armor. Ultimately, she gets the wanted movie after 8 sex scenes (including her own - shown twice) and the detective experiences something beautiful with one of the Yab Yum girls.