Joseph W. Sarno - Vampire Ecstasy [+Extra] (1973)

In the mountains of Germany stands a grim and secluded castle - the haunted legacy of the beautiful medieval vampire Baroness Varga. Put to death for her ravenous hunger for female blood, the Baroness uttered a curse that she would one day return to forever satisfy her unnatural lust and that day has finally come. Four women have gathered at the castle unaware that its darkly seductive housekeeper is a satanic high priestess presiding over a coven of delectable servants who each night perform sensual rituals and profane acts to keep the Baroness' spirit alive. As the women are drawn deeper into the ultra erotic nightmare, it will be the most uninhibited among them who shall serve as the vessel into which the Baroness passes to continue her unholy reign of terror.