Sixteen(1972)

"Mercedes McCambridge is Ma Irtley. Threatened with salvation... Her daughter ravaged... Her son seduced... That's what $8,000 got the Irtleys!"

Hickspoiltation film from the early 1970s ostensibly starring Oscar nominee Mercedes McCambridge, but really more a film looking for an excuse to show off Simone Griffeth's beauty. She plays a daughter of a swamp family. The whole family goes to a carnival where she is seduced by an older male performer, while her teen brother is seduced by an older female performer.