団鬼六　白衣縄地獄 (1980)

A nurse working at a hospital is looking forward to her marriage with a handsome doctor. But she is open minded as she also is having an affair with a pretty student nurse. One day a former patient invites her to her house. But when she enters it appears that a robbery is taking place. Two masked men grab her, bind her with rope and proceed to violate her repeatedly while photographing the whole ordeal. She is released but is soon blackmailed into returning for intensive B&D training. Can she keep up the premise of a happy marriage without succumbing to depravity of the rope and the lash?