We All Go Down (1969)

Pete (Bill Doukas) and Nancy (Alice Haley) look like a lovely couple except they are only together through drugs. Nancy wants Pete, but Pete just wants money for drugs. She gives him some cash and he says thanks by promptly leaving to shoot up in the men's room of a go-go bar. Not wanting to waste a good night, Nancy leaps into the sack with her lesbian roommate. At his father's beach house, Pete discusses life with Carrol, his real girlfriend before he informs her that his friend Rick will be joining them for the weekend. Unfortunately, accompanying Rick are a bunch of truly wretched human beings; Burt, an arrogant rich slob who immediately puts the moves on Rick's girlfriend; And pretty-boy Jay who first goes after Carrol before raping her cousin Sandy. Unable to deal with them, Peter tries to score some amphetamine from his pusher but the guy only has LSD: "Acid tonight, A tomorrow!" Peter promptly takes an S&M-tinged trip. Meanwhile, Nancy is informed by a scary stranger that Pete sold her to his pusher who, in turn, sold her to him. Though outraged that Pete literally sold her out, Nancy doesn't seem bothered at being bought.