The parents think they know best just as the teenagers do.  When you were 15 or 16 just coming into your interest of the opposite sex, were you really concerned about what your parents or teachers told you was correct, or did you ultimately find out on your own?  Not every kid wants to have sex in high school, but for those that do,  I'm sure we can all understand that most of them will not be wanting direction from a teacher or a parent, but we should be understanding if they have questions.  I think we should stay out of something we discovered on our own as kids as our kids will do also.  Who can honestly say their first sexual experience with a boy or girl was guided by a sex Ed class or a concerned parent?