The problem here seems more unwanted pregnancies than with teenagers having sex.

I se how less sex is an easy solution to the problem, but it is also the wrong one. Your teenage years are when you have the more energy and hormones, you are basically built to have sex. Not to mention it's healthy for the mind and body.

It would be like not allowing teens ride bikes because of possible crash with cars since stats show teens are more likely to have accidents than adults.

Better find a way to limit the accidents themself: you get healthy kids, having fun, and they grow into better adults.