It Couldn't Happen to a Nicer Guy (1974)

A beautiful woman kidnaps a random family man at gunpoint ("for kicks"), drives him to a secluded spot, orders his to strip naked, and then rapes him in the back seat of her car, before sending him on his way naked. He reports the incident to the authorities as a rape, but they either don't believe him, or, if they do, can't understand why he would consider it a crime - a reaction he also gets from his friends and family.