Love Is a Carousel (1971)

Doria leaves home after being raped and deflowered by her stepmother's boyfriend while her stepmother drunkenly watched. She is picked up on the highway by Jackie, a lesbian whose tenderness contrasts with Doria's recent experience. Doria then meets two artists, Tee Jay and Julio, who use her as their model and introduce her to a bohemian life of parties and such drugs as marijuana and LSD.