When I was eight, I was leafing through the World Book Encyclopedia and saw what looked like a moose's head and it caught my attention. Next day in school, I was the coolest kid ever.
Since I was the smart kid in the family, I guess they assumed I had already devoured the encyclopedia and never gave me the talk. My older brother did get the "use protection" talk but I never got it (because they assumed I was too geeky to score with a chick???)
Oh, I'm 21 now.
Edit: I typed my age wrong the first time. I was eight, not seven. Just remembered that it happened in Winter '93.