Lustful Feelings (1977)

Smalltime coke dealer Tony owes some mobsters a substantial amount of money, so he convinces his beautiful girlfriend Joanna to do a little work as a nude model in order to make the necessary cash to pay off his debts. Unbeknownst to Tony, Joanna has decided to become a prostitute instead. Complications ensue after Joanna discovers that she likes and enjoys her new line of work.