History teaches us a lot of things about the past, present, and future. Of course, the required classes that you're forced to take during the fundamental years of your education are usually a little dry—you learn about wars and societies and religions and governments. What they don't teach you in primary school, however, is the freaky stuff. But don't worry, we'll catch you up on everything you missed between the lines because your teacher was trying to stay on task. There's a saying that goes "history repeats itself"—whether or not it's an accurate statement, we're down to try out some of these old-school sex tips. Flip through the gallery above, we've got nine quick lessons you won't want to miss.