Oedipus Orca (1977)

This is an unusual Italian movie in that it is a sequel to "La Orca", a film made only one year earlier (Italy in the 70's was infamous for cheap rip-offs, but not really for sequels). "La Orca" was a rather notorious film about a spoiled teenage girl (Rena Neihaus) who is kidnapped and has to use her sexual wiles to survive. This movie picks up right afterwards when she is taken back to her family and boyfriend. Her family is a little odd. Both her mother and father come in the bathroom, for instance, while she's in the tub after her ordeal (or maybe that was a normal thing to do in 1970's bourgeois Italy?). Her boyfriend insists on feeling her up on their first date after the incident, which triggers a sexual flashback from the first movie. But she is herself is obviously disturbed–she gets her boyfriend to take her back to the shack in which she was held in the previous film where, unable to persuade him to have sex, she masturbates (and further pads the running time with more flashbacks from the first movie).