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The history of each medium itself, complicated based on the broad definition and usage.
A well-known example is The Dream of the Fisherman's Wife which depicts a woman being pleasured by two octopi.
It was Nakamura Kokyo's journal Abnormal Psychology which started the popular sexology boom in Japan which would see the rise of other popular journals like Sexuality and Human Nature, Sex Research and Sex.
Originally, Tanaka Kogai wrote articles for Abnormal Psychology, but it would be Tanaka's own journal Modern Sexuality which would become one of the most popular sources of scholarly information about erotic and neurotic expression.
Mark Mc Lelland puts forth the observation that the term "hentai" found itself shortened to "H" and that the English pronunciation was "etchi", referring to lewdness and which did not carry the stronger connotation of abnormality or perversion.
The late 1960s brought a sexual revolution which expanded and solidified the normalizing the terms identity in Japan that continues to exist today through publications such as Bessatsu Takarajima's Hentai-san ga iku series.
In Japanese, the term describes any type of perverse or bizarre sexual desire or act; it does not represent a genre of work.
Japanese animation (anime) had its first hentai, in both definitions, with the 1984 release of Wonderkid's Lolita Anime, overlooking the erotic and sexual depictions in 1969's One Thousand and One Arabian Nights and the bare breasted Cleopatra in 1970's Cleopatra film.
Erotic games, another area of contention, has the iconic art style first depicted in sexual acts in 1985's Tenshitachi no Gogo.
However, Osamu Tezuka has helped define the modern look and form of manga, and was later proclaimed as the "God of Manga".
though it was the popularity of Tezuka's Astro Boy, Metropolis, and Jungle Emperor manga that would come to define the media.