Sins of Desire (1993) - IMDb

Pecados do Desejo: Dirigido por Jim Wynorski. Com Gail Thackray, John Henry Richardson, Delia Sheppard, Tanya Roberts. Suspecting foul play, Kay Egan goes undercover to work in a suspicious sex clinic where her sister went to therapy before killing herself. And Kay is not the only one watching the sinister married couple who runs the place.

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