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The English word "Hentai" likely came from 4chan. Thus, like a lot of Japanese
loanwords that come from 4chan, I have to ask whether the Japanese actually
use the word to mean "Anime porn" like in English.

If it isn't, or if a different word is more often used, could someone share
what that word is? The Japanese people I communicate with always find my use
of it confusing or wrong.
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question
word-choice
Do the Japanese actually use the word "Hentai" to mean "Anime Porn", like in English?
No, _hentai_ is [a typical
"英製和語"](https://japanese.stackexchange.com/a/18544/5010) that has gained a
totally different meaning outside of Japan. It never means anime porn in
Japan.

Wikipedia defines _hentai_ as "catch-all term to describe a genre of anime and
manga pornography." In Japanese, this idea is well described by a slang word
二次元【にじげん】 (lit "two dimension"). The opposing idea is of course 三次元【さんじげん】
("three dimension", live-action ones or sometimes real people). They are often
contracted to 二次 (lit "secondary")/三次 (lit "tertiary"). 18禁 is too broad and
エロアニメ/エロ漫画 are too specific.

Most Japanese 二次元 fans understand these [ateji
argots](https://japanese.stackexchange.com/a/44255/5010): 虹 (lit "rainbow")
for 二次元 and 惨事 (lit "disaster") for 三次元. Yeah, posting a 三次元 image to a
certain type of image board is certainly disastrous to the users :)

**EDIT:** Oops, I should've mentioned that 二次元/三次元 by themselves do not
necessarily refer to X-rated ones, while it's hard to imagine a 二次元 fan who
dislikes 二次元 porn. [二次元コスパ](http://nijigencospa.com/) does not sell X-rated
goods, for example.
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answer
If I remember correctly from watching anime. They just put ero in front of the
item type. So, ero-manga or ero-gemu it is.

OT, when we think about it for a second. From the original hentai word
meaning, what is so hentai about anime porn? Is it because of nijigen (two
dimensional) erotism is weird or is it because from commoner's (casuals) point
of view, porn manga or anime is enjoyed by a hentai?

edit. there is actually word 'ecchi' which can be used like ecchi na hon
(erotic book). From wikipedia link above, ecchi derived from Hentai first
letter. So maybe, hentai was actually used at some point in Japan?
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answer