Little Orphan Dusty (1978)

Dusty is a runaway teenage girl who gets attacked and gang-raped by a group of savage motorcyclists. She gets taken into the household of a sympathetic artist named Frankie whom she falls in love with, but has problems adjusting to his artistic and social lifestyle. Dusty and Frankie decide to get married, but the bikers haven't forgotten her and plan to crash the ceremony to commit more mayhem.