I answered 14 but I think I might have been 12 or 13. That was 20 years ago, but I know I was still in grade school. I knew a girl then (same age) who was a friend but not a girlfriend. We were up talking one night and just started kissing and then it went on further from that. After that, we were always going at it whenever we got the chance. Eventually, her mother caught us and had a massive fit-- called my dad and just went frickin' insane on both of us!
When I was younger than that, a female babysitter would mess around with me while my mom and dad was at work, but I don't count that as "100% lost it" because I could not orgasm, although there was penetration, oral sex and such. She was about fifteen-sixteen at the time and pretty. She would make me lay on top of her and put it in. Once she had me finger her and then made me lick my fingers clean when she was done because she said it would make my dick grow. I don't really feel like I was molested because I liked it and it wasn't abusive or anything, but I wouldn't want the same thing happening to one of my sons. I guess I was about 10 at the time. Maybe a little younger.
PS-- Dad came home from work early one day and kind of caught us. He didn't see "it" going on, but definitely knew, and they quietly let her go.
(A few years later, after hitting puberty, I was spending the week with my grandmother during summer vacation and met up with the girl and blackmailed her into having sex with me one time...turned the tables on her so to speak. It was alot more fun with a grown boy's weiner, and she really got this panicky look on her face when I came inside her without a condom! Maybe I should feel bad about doing that...but it felt more like revenge. I remember seeing her with her boyfriend after that and she had this guilty look on her face and it made me feel a kind of mean-spirited satisfaction.)
I feel like a weirdo telling you all this.
Am I crazy, shrink?