Wrong Way (1972)

Two girls are driving home when their car breaks down in the country. They are kidnapped by a gang of drug-crazed hippies, and repeatedly raped. They escape, but soon run into a death cult who plan to gang-rape the girls, then kill them. Meanwhile, the father of one of the girls gets the police to begin an investigation into their disappearance.

Wrong Way was one of the banned 80s horror films seized under Section 3 of the Obscene Publications Act. No UK re-release.