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 lolicon boom of the 1980s saw the rise of magazines such as the anthologies Lemon People and Petit Apple Pie.
The publication of erotic materials in America can be traced back to at least 1990, when IANVS Publications printed its first Anime Shower Special.
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.
With the usage of hentai as any erotic depiction, the history of these depictions are split into its media.
To define erotic manga, a definition for manga is needed.