In my own experience, one of them, anyway, the person was in the family and we were both kids. My relative was a little older (teens). I was just young and nieve enough think that the game we were playing was really a game. I had no clue about sex yet, and I trusted this person, so I assumed that everything was okay and it was all play. We never went past our underwear. Now that I am an adult, I know the truth. I still have some trouble seeing as it really was though, because I like to think that well, this person has his own set of mental problems to begin with, and blame it all on that. Nobody has ever asked me to talk about it, though, at least not yet. I like to think that I am doing okay with it. In any case, I still don't trust this person alone with my kids.