The Doom Generation (1995)

Amy Blue, a 17-year-old speed princess, her sweet, naive boyfriend Jordan White and a supernaturally sexy drifter, Xavier Red, are forced to embark on a bizarre road trip after Xavier inadvertently blows the head off a QuickieMart clerk. The trio flee into a dislocating world of dizzying, nightmarish violence and omnipresent danger. As this youthful band of outsiders travels through the wasteland of America, Amy finds herself screwing both Jordan and Xavier, forging a triangle of love, sex and desperation too pure for this world.