The Manhandlers (1974)

A gorgeous girl named Katie inherits her deceased uncle's business and decides that she too can be a businesswoman and hire two hot girlfriends. Katie doesn't like the brothel part so she gets rid of that and is soon giving legit massages. The mob doesn't like this and Katie is quickly being muscled by mob goons to turn up the heat or pay. Katie soon discovers more about the massage-parlor than she had wished.