A Boy and His Dog | 1973
A boy who is living in a post-apocalyptic world communicates telepathically with his dog. As they scavenge for food and sex, they accidentally discover a society under the ground that is preserving the former society of the world. The daughter of one of the leaders of this community seduces the boy and gets him to join them. What the boy does not realize is that he is being used for impregnation purposes only by the sterile group and will be discarded once he fulfills this task.