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What Is Yaoi?
Yaoi is the abbreviation for "yama-nashi ochi-nashi imi-nashi" , which can be roughly translated as "no climax, no resolution, no meaning". The characteristic feature of yaoi manga is male homosexual love, usually between characters from well-known stories. It is also known as "shounen ai".
This explaination was taken from Aestheticism.
Thanks to Eni-chan for helping me with this.