I was as horny as the next kid, and I’ve only had sex with my wife, and only had sex after we were married.
I had the opportunity, but knew it was wrong.
Just as I had the opportunity to steal, to kill, and to do other things that were wrong, but knew they were wrong.
We expect people to obey other laws. We would expect a horny ugly boy to refrain from sex if no girl will sleep with him. SO why can’t we expect other boys to refrain?
I'm not sure the comparison is apt. It's not illegal for teenagers to have sex (unless they violate statutory rape laws)