Ambush at Dark Canyon (2012)

At the very beginning of the movie, a woman is in bed with her back to the camera. It's obvious that she has no clothes on, but only the top half of her buttocks are shown (a bed sheet covers the rest). She lays in bed with a bare-chested man in underwear who gets up, dresses and leaves without saying a word. In his later comments, it is obvious he is a bit of a womanizer.