Pretty much since i discovered what sex was I was fascinated by it.
As a child my brother and I found our father's Playboy magazines and would sneak in and look through them. Not understanding what was "wrong" about looking at naked people, or perhaps we were both just entirely too fascinated by naked people.
Anyway I went through a stint where I didn't want to engage with sex with anyone but I wanted it, fantasized about it etc. So pretty much most of my life knowing about it (and i learned young though I don't remember from where)I've been entirely too fascinated by sex -snicker-
I was constantly thinking about sex when I was going through puberty, but I think that's kind of normal. It was something I wasn't allowed to have, even though my body wanted it, and that made it more desirable.
Now that I'm an adult I enjoy sex, but in a more laid back sort of way. I don't have to have it every minute anymore.