Adultery is one of many sexual activities that violate our social mores, and the many humorous legends we've devised about it are our way of expressing tacit disapproval of marriage partners who fail to "forsake all others." The lesson of all these legends is clear: Don't cheat, because you won't get away with it. No matter how well you try to cover your tracks, no matter how completely you think you're deceiving your partner, you will get caught. The tales below demonstrate this principle to a tee.