Some thoughts on the term "hentai".

If you talk to someone from Japan, and you use this term, they might have no clue what you are talking about, unless they know a lot about the West.

It comes from part of a Japanese word which loosely means "sexual perversion" and is primarily used in the West. Even in the West though, it is more like slang than a formal term. Terms like animated porn, or if someone wants to exclude Western style content, anime porn are probably better in a more formal context. Or perhaps, it could be referenced as an erotic artform (one concern I've had is that someone might single it out in a rather racist / discriminatory fashion, rather than acknowledging it's artistic value as someone might any other form of art).

I'm not really arguing *against* using it, if you like using that term, but it's probably best used as a form of slang than in anything formal. And this is anecdotal, but from what I've seen, the term has actually been in decline (particularly in more formal settings) for a number of years.