I was young and asked my dad what sex was and he told me "The difference between a man and a woman". I asked him what that ment and he only repeated it, so I never had "the talk". Sex-ed was so far removed from the act, I still had no clue what it was afterwards because the "see through" diagrams shown didn't make any sense at all and I thought the side view of the penis medical diagram didn't look anything like what I had. I didn't even know women had "three holes".
So I learned about sex and anatomy from porn, BUT this was before the net really caught on in the dial-up days when the 2400 baud modems, so that ment my brother's "Barely Legal" porno mag and any naked breasts in movies I could get my hands on.
It's sad really, a kid seeing a photo of a vagina or penis for educational purposes in a classroom just to know what the hell they look like won't shatter their sanity. Adults think if kids see what body parts actually look like, they'll turn into porn crazed deviants, but don't realize not giving the right information clearly actually drives kids to porn for their education.
If I had known what sex was instead of charts and medical terms, I wouldn't have looked in a magazine and found an advertizement for a video of a guy with two dicks getting blown by two women at the same time... now THAT will screw with an 11 year old's mind when he's not seen anything sex related.