La Marquise von Porno (1977)

At the heart of her castle, the Marquise Katarina Von Porno inflicts, as a exemplary tyrant, the worst sexual tortures to her guests. Difficult to stand up to her, the Marquise is also an immortal witch one hundred years hidden behind the facade of a young woman in her early thirties and she has fearsome magical powers the snap of a finger may reveal a bed or undress her completely.