Interesting topic! It's not often you come around a
serious topic about sex.
I started thinking about sex around the age of 12-13. Like most young boys I'd looked at porn and such and started imagining what it must be like. I distinctly remember thinking that blowjobs are probably the most satisfying(?!). Although I had a few girlfriends, it wasn't until a few years later that I got comfortable enough with a girl to ask her if she would sleep with me.
The actual experience was well, amazing. I know a lot of people say the first time isn't that good, but that certainly didn't apply to us--it went really naturally (everything "fit"

) and it was just, well, spectacular. I was with that girl for over a year before it went truly sour and we broke up. We still talk.
After that relationship I've slept with a few other girls, but to be honest that's still my favourite relationship on a sexual level. I think we just matched up really well, or perhaps I was really in love with her. I make it a point not to have sex with girlfriends too early, before I know I really like them.
When it comes to my parents, I'm sure they know I slept with some girls, but I never talked to them about it. They once talked to me about using condoms and/or making sure the girl is on the pill, but other than that they're leaving me to my own devices. Which is just fine, really--that stuff is
super uncomfortable.
I don't talk about sex with my friends. There's one friend I talk to for picking up girls, but when it comes to sex, we don't talk about it. Not sure why, I don't think it's a shame issue--it's just not a subject that comes up.
Jam it back in, in the dark.