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Because both this film and the previous year's Die Jungfrau und die Peitsche were directed by Jesus Franco and based on the same book (Philosophy in the Boudoir by the Marquis de Sade), they are often confused, particularly since both films were released under the same alternate title, De Sade 70. This version is far more explicit than its predecessor. The plot is also quite different, placing Eugenie in suburban Berlin, living with her widowed father, Radeck (Paul Muller). Radeck is a sexual sadist, and when Eugenie discovers his secret lifestyle, they slowly lose their grip on the distinction between good and evil, planning the sex-murder of a young model as the perfect crime. Their experiment ends in tragedy, and Eugenie tells her story to a writer (Franco) as she lies dying in a hospital bed. Beautiful actress Soledad Miranda (billed as Susan Korda), who was killed in a Lisbon auto accident in 1971, carries the film, and Muller is fascinating as her perverse father. Marie-France Broquet (appearing under the pseudonym Alice Arno) co-stars with Andres Monales, Greta Schmidt, and Karl Heinz Mannchen. Franco made three more films from the same source, Plaisir a Trois (1973), Cocktail Special (1978), and Eugenie, Historia de Una Perversion (1980). The X-rated version runs 95 minutes, while a less-explicit print runs 10 minutes shorter.