Do you know what Lyndon Johnson nicknamed his penis? Or which U.S. president was photographed in a bathtub receiving oral sex from a partner who was not his wife? Find out how much you know about the state of our presidents' unions by taking Playboy's Presidential Sex Quiz. Even if you get all the questions wrong, you can still celebrate Election Day by working the presidential phrase, “Are you prepared for the storm of lovemaking with which you will be assailed?” into your vocabulary. [Playboy.com]