
Yea like, the thing with middleschoolers having sex is it happens all the time even among teenagers who arent reading mangas/fiction like this. There are a lot of factors on why its like that and one of them is medias consume by teenagers, but it was only one of the factor. There are a lot of middle schoolers who read smut mangas but choose to not be sexually active either.

You're right, they really shouldnt. But as I said there are many factors why. Parents, peer pressure, failure in education, mental health, media consumption are just some of the factors and not every middle schoolers has the same formula that makes them do or not do something. It's complicated, so some niche manga depicting middle schoolers having sex aint going to normalize it as much since another factors are always up there too.
Im going to make myself as an example. I had sex first at middle school and I did consume some smutty medias then, but the reason on why I did that was my own insecurity and desire to be better than another girls. My parents educated and supervised me well, there would always be something else. Even in villages where internet is practically unknown teenagers are still doing the do left and right lol
I don't wanna be rude but like why were ryos parents just letting him sleep with anybody when he was in whole ass middle school like we're y'all not supervising him enough that he basically got involved with anything that had a hole in it. Like whyyyy let's not normalise middle schoolers having sex now please