THX 1138 (1971)

Five hundred years into the future, in THX 1138 (1971), modern man inhabits large underground cities policed by robots and programmed by a central computer. All citizens are forced to take drugs to inhibit their desire to inhabit each other's private space. When THX 1138 (Robert Duvall) and his life mate LUH 3417 (Maggie McOmie) cut down on their doses and discover that they have sexual appetites as grand as distant galaxies, LUH becomes pregnant and mother-fucking, mammy-loving mayhem ensues. In George Lucas’s first and sexiest attempt at science fiction, you’ll need to use the force to keep your hand from going down your pants when you get a look at Robert Duvall’s plump duff! It’s out of this world!