I hope this post is okay, then. :S
My dad had the "sex talk" when I was 9, but I was under the impression that it's something only married people do. When I was about 11 (I'm not sure how this topic came up), my friend just flat-out asked me how often I masturbated, and I had no idea what that was, but I didn't want to be an idiot and just replied "a few times a day". I remember him being really surprised but didn't say anything more about it.
About a year later or so, my step-brother and I were watching one of the Scary Movies, where this girl and guy were about to die since they were locked in a freezer or whatever, and she goes on jacking him off (obviously you don't see anything), and my brother commented on it. I thought he said "master bathing" and googled it after the movie, eventually coming across the proper spelling of "masturbating", so I clicked on that to see what it was about.
And so it all started that night.
I learned about sex in school later that year, but I don't even know if you want to call it "learning". Sex Education was pathetic, now that I think about it. We learned about the anatomy of the male and female and what happens during puberty (they didn't talk about the penis or breast, just the body hair, voice change, and bone growth in guys, and wider hips, periods, and eventually menstruation in girls). I guess they assumed that we were all experts in sex so they just said "remember always to use a condom", and that was that and we moved onto other topics. Not much more was different when we all "re-learned" it in high school in our Health class, but again, I guess they all assumed we were already experienced. I suppose they wouldn't have been so wrong, for the most part.