I didn't know what sex was until I was 11 and that was only because I found my aunt's dirty porno book she hid under the microwave in my grandma's house (IN MY GRANDMA'S HOUSE.) I definitely knew people in high school who were kind of fuzzy on the details until we had sex ed. I am sure it still happens - I have coworkers with kids that age who point blank REFUSE to talk to their kids about sex because they're scared to death the kids will IMMEDIATELY have unprotected sex and hundreds of babies.

I'm not saying that the community has to protect that way of thinking, I think that's a stupid way of thinking personally, but I also think early exposure a discussion about sex should be... well a lot more professional than that. Let's have sex ed then let's talk about risky sexual behavior and why it isn't worth it.