Hitozuma bôkô kinbaku (1981)

A wife, frustrated by her husband's self-serving sex life, becomes interested in and excited by the glamour photos she accidentally sees in an S&M magazine. Unable to control her feelings, she invites one of her husband's drinking buddies to try S&M play, but her husband finds out. The wife insists that she was only tied up by the man and is the victim, but what action will her husband take?