I live in an Islamic country, it’s considered bad but many underage people have sex
I’m not sure about japan, but judging from the culture, it’s definitely not common
But it might be common or considered normal in other countries (I think united stated is one of them, tho it’s definitely against the law but apparently it’s pretty common)
there's a lot of mangakas that make the histories in a way that can be read as a report as well, like, there's REAL persons who go through it and have to deal with prostitution like it's something normal, so it's nothing to be shocked or surprised cuz unfortunately it's something a lot more common than you think, and remember, just because you don't hear about it, it doesn't means that it. don't existes! Japan is a country known as good at hide the dust under their carpet. be careful.

yo why in bl manga is it so common and normal for underage highschool boys to be doing sex work. like is that a thing in japan?