Hi there. I have a friend who could be one of the most prestigious people on this site for one reason. No, he's not good at skiing, he peed inside a girl. When he was 10.
So the story goes like this: He was at a party when he was in fourth grade, and some highschoolers were there (don't know why, they just were). So they were playing truth or dare with some drinking involved, and he got dared to have sex with a 16 year old. I guess they went off into the woods and he just kind of stuck it in. After a little bit, he felt some pee brew up. He had a little 10-year-old's boner and he didn't know what to do, so he peed inside her. Not sure what happened after that, but I think it ended with her getting pissed (pun intended) and leaving. To my knowledge, this is the closest someone that I have heard of peeing in a girl, and he was 10.
I apologize for the poorly written story.