A guy is very religious and wants to observe the Sabbath properly. So he goes to his minister and says, "I know I am not supposed to work on the Sabbath Day, but I don't know whether sex is work or play. Can I do it on the Sabbath." The minister says, "Sex is for making children, and that is work, so you cannot do it on the Sabbath."

He was not very happy with this response so he goes to a priest. The priest gives him essentially the same opinion.

He is pretty desperate now, so he goes to a rabbi. The rabbi says that sex is definitely play and he can do it on the Sabbath. The guy is elated, but he asks the rabbi, "How can you be so sure that sex is play." The rabbi says, "Because if it was work, my wife would make the maid do it."