"Less stringent measures/less uptight opinions* regarding sex = fewer problems with teenagers regarding sex.

*I'm not referring to you specifically, but rather the general feelings on sex in the US compared to those in Europe. EDIT: I just realized, I've confused this thread and the other one on AoC laws going on right now. There's a link in there which shows some interesting figures."

Information is also MUCH more available over there. I think that is the key, not a bunch of 15 year olds rutting.