Main actress completely undresses and you see a full frontal of her naked breasts. Then she puts on the man's pants, completely zipping them up. She gets into bed with him and lies on top of him, almost forgetting to unzip the pants. She giggles and unzips them, then she proceeds to get on top of the man and have implied sex.
Later on, the couple makes love again in the desert. This time, we see them nude after they have finished.
We never actually see anybody having sex; we only see before and after, although we do see the man and the woman kissing immediately prior to undressing in the desert.