Mistress

It is claimed that Parisian masochists didn't merely volunteer for treatment in the Dungeon scenes, but actually paid for the privilege.

The film was rejected for a UK cinema certificate by the BBFC in 1976 and only passed in 1981 after 4 minutes 47 secs of cuts with heavy edits made to a woman being bound and whipped, shots of abrasions after a man is whipped and subsequently probed with a needle between his buttocks, and a scene where a male client has his genitals nailed to a plank of wood and his nipples pierced. The cuts were fully waived for a UK 18 DVD certificate in 2003.