He's trying to hit her V, shoot him. In all seriousness, though, I was watching a program a while back about teenage pregnancies. It was like The Sun (UK trashey tabloid) on TV. There were 13 and 16 year old girls pregnant with 20 and 21 year olds, it was sad. The girls couldn't comprehend anything, really. I'd say have a good long talk with your sister, and make sure your friend isn't taking advantage, and that she knows whats going on. If he is, get a nice old balaclava and a bat, as stated before by others... Around the 11-17 age range, I'd try not to go over 2 years in age difference, though I do know a 17 year old that goes out with an 11 year old, I try not to get involved in that.