Hip Hot and 21 (1966)

Naïve young country gal Diane gets sold by her abusive father to hunky stud Rick for only fifty bucks. Alas, Rick turns out to be a total no-account jerk who leaves Diane high and dry to fend for herself in a cheap apartment after spending a single night with her. Pretty soon Diane finds herself in all kinds of trouble with the low-life characters who live in the apartment with her.