I am talking public (and private) schools becoming sex ed teachers.

You brought up parents belonging to churches, in particular the Catholic Church.

I do not think government or private school's role is one of teaching sex ed to students as some of that teaching could or does goes against parents beliefs, be they religious, moral or 'other.' 

I believe parents role is to teach sex ed and morals and values to their own children (among other things.)

The good thing is: parents receive an "opt out" form to remove their child from public sex ed classes should they so desire. 

I am old school-but we did not practice putting condoms on a penis model (like they do today)  and we also had much less teen pregnancies among my classmates.  I tend to think that is because of parenting back then.