Do a quick search online for strange sex laws in the United States, and you’ll find a treasure trove of oddities, many of which seem too weird to be true. That’s because most of them are urban myths with little or no basis in reality, and no corresponding written laws. Whether or not you can marry your cousin in the United States varies from state to state. “No person who is afflicted with a venereal disease shall marry in this state.” So says the law in Nebraska. Six states—Idaho, Illinois, Massachusetts, Mississippi, South Carolina, and Utah—still have fornication laws, which basically decree all forms of non-marital sex illegal, but these laws are rarely enforced.