I try to live my life to the fullest possible extent. I had my first sex with twelve, first got drunk at ten, smoked my first spliff at twelve and took my first line of coke at 14. I can't say that I regret anything I have ever done. By now (i am 17 now) I have had sex with about 13 girls, taken pretty much every drug known to mankind and generally had a lot of fun.
I think you should always keep in mind that every day could be your last - make the best out of it!
To be honest, I also don't think that there is such a thing as a "bad experience" (apart from maybe being abducted raped and tortured by your own dad). Everything I've been through has formed me into the person I am now, and I am proud of that. Therefore I don't think there is anything wrong with having sex as early as ten. If you think that is a good idea at the time than why not do it?
Ohh, and to all who think I am some hopeless junkie: I got 7A* and 5As at GCSE and I am predicted straight As at AS + A2