Vibrations (1968)

Barbara a frustrated writer who is also sexually frustrated seeks to recharge her life by moving into a Manhattan apartment where she earns money typing up manuscripts for other writers Next door a sexy young lady plays a variety of erotic games revolving around her hypnotically humming vibrator When Julie Barbaras hottotrot sister shows up she reluctantly allows her to stay even though memories of incestuous girlhood explorations between them cause her obvious distress