Cathy is a professional sm dominatrix. she started as a prostitute at saint denis street in paris at the age of 21. little by little she started speciallizing in sadoasochism and "passion men". Nowadays she is 57 and thinking about retirement. She gives us an insight on her work and her relationship with her clients some of whom she knows since 20 years ago. an encounter at the backstage of a sadomasochist dungeon.