In short, where a man has intercourse with a woman up against a wall. One of the most common sex positions in movies and TV, probably due to the way that you don't have to disrobe completely, keeping explicit nudity ratings down, while allowing itself to be worked into almost any setting. It is also good for driving home just how passionate the affair is, since this is the de facto position when one or both parties are cheating. In Real Life, this is not as easy as it looks. Holding someone else up like that gets tiring pretty fast, plus most men lose muscle control during orgasm and could risk dropping the poor woman.