Mijn Nachten met Susan, Olga, Albert, Julie, Piet & Sandra (1975)

Alternately titled Secrets of Naughty Susan, the Dutch erotic drama Mijn Nachten met Susan, Olga, Albert, Julie, Piet & Sandra (1975) is a twisted psycho-thriller boasting heaving bosoms and spine-tingling chills. Filmed at the infamous Hulze Piranesi--an architectural landmark that has served as the real-life setting for a number of exotic parties--the film chronicles an evening of horror in which an ensemble cast of beauties struggles mightily to survive. No one’s got more invested in the fight than sexy Willeke van Ammelrooy, a busty beauty who offers to boff her loverboy while the killer peeps on them from an adjoining room.