My sex ed class in middle school (7th grade?) was generally just about STDs. And it was disgusting. The phrase "cheesey discharge" comes to mind. We went into great detail on what STDs were out there, how you can catch them, and more specifically what the symptoms were. After talking for a half hour about having little critters living on/in your groin, I don't know how kids can decide to have unprotected sex anyways.