Peaches and Cream (1981)

Annette Haven plays a down-on-the-farm girl who decides, after a confrontation with her stepfather, to head out to the big city. There she finds that she has to sell her body if she wants to make the really big money, so she jumps right into action and becomes the classiest hooker in the Big Apple. One night while driving, she sees a hustler being accosted by her pimp. Annette saves the girl, leads her to someone who can do some good and with a little coaching by Annette, the new girl becomes another high-class prostitute.