Topaz (1992)

A reticent, stiff and introverted office worker, Takafumi, joins a secret BDSM club to have dominatrices surprise him at random times. The club offers a wide variety of ways in which he is beaten and humiliated, the treatments are compulsory and unexpected as to time, place, manner and mistress.

A look a the lives of two sex workers in Tokyo: Rei, who works as an S&M dominatrix, and Ayumi, in the more straightforward profession of call girl.