No no. I'm not making nothing forbidden. I didn't say anything about making them forbidden. I said "don't let children figure out what sex is, through porn and hentai." I'm proposing that you TEACH them what sex is, BEFORE they browse the internet.
What I'm suggesting, is you teach the boy as soon as he had his wet dream, so that when the boy eventually
finds his way to porn and hentai, he'd already be equipped with enough knowledge to navigate through contents that may just be fake and or for entertainment.
It's like if you taught yer kid how to respect firearm by bringing him with you to a gun range and to a gun shop. Heck, teach them how to shoot, why not. I'd rather them know the weight of a loaded rifle by seven than have them think what a gun should be
from vidya games and movies.
There have been cases in 3rd world countries where girls and boys try out some shit they saw in porn and ended up with someone dead or absolutely traumatized. This is because like you said the parents simply forbid them something, without explaining to them what anything even is.