Emanuelle and Joanna (1979)

Emanuelle, an unhappy housewife desperately seeks to free herself from the brutal sexual excesses forced upon her by her husband, Roberto. She attempts to find solace in an affair with a younger man, but is abused by him as well. In desperation she turns to her sister Giovanna, who runs a brothel, specializing in sado-masochistic games. With her help, she plots her revenge upon the men who have mistreated her with a display of sexual excess.