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Another form of adult animation is Bishonen. "Bishonen (also bishounen) is a Japanese term literally meaning "beautiful youth." It describes an aesthetic widely shared in Asia - a young man whose beauty (and sexual appeal) transcends the boundary of sex. Recently, it has shown strongest manifestation in Japanese pop culture, but it has roots in ancient Japanese literature, the homosocial and homoerotic ideals of the medieval Chinese imperial court and intellectuals, and Indian aesthetic concepts carried over from Hinduism, imported with Buddhism to China...
...Some have theorized that bishonen provides a non-traditional outlet for gender relations. Moreover, it breaks down stereotypes surrounding effeminate male characters. These are often depicted with very strong martial arts abilities, sports talent, high intelligence, or comedic flair, traits that are usually assigned to the hero/protagonist." Wikipedia.