This film was banned in its native France for several years.
The last role for French actress Joëlle Coeur. During her short four-year career, she appeared in 20 cult erotic and horror films from 1972 to 1976, most made by French director Jean Rollin. Then she finally retired from acting when French films started focusing on hardcore, which had just been legalized. Rollin said the new permissiveness held no interest for her. She never had an issue performing fully nude and in simulated sex scenes, or modeling for nude photos, but she refused to participate in actual sex onscreen, even though other French actresses were doing it.
The original French title, 7 FEMMES POUR UN SADIQUE, translates more logically as "7 WOMEN FOR A SADIST".
The book Francis is reading in bed is Guy Endore's "The Werewolf of Paris", generally considered to be the inspiration for Curt Siodmak's screenplay of Universal's original The Wolf Man (1941).
Howard Vernon, who plays Zaroff's servant Carl, also takes on the role of Carl's father, Zaroff's previous major-domo, on his deathbed.