Here are some links that provide information about yaoi. I would encourage you to read them. 
Aestheticism
This site gives information on yaoi. Although the site hasn’t been updated, it is still a good resource.
Yaoi Research
A website which is doing research on the yaoi phenomenon.
Yaoi bibliography
Scholarly articles on yaoi
Yaoi Con 2009
Information on the upcoming yaoi convention.
Male Homosexuality and Popular Culture in Modern Japan
Gives a history on homosexuality in Japan and discusses homosexuality in popular culture as of now.
Reading Yaoi Comics: An Analysis of Korean Girls Fandom.
Insightful article on yaoi in Korea.
Yaoi: Redrawing Male Love
Gives a good overview of yaoi. And excellent essay.
Boys’ Love, vs. Yaoi: An Essay on Terminology
Interesting view on the terms within the yaoi genre.
Brief History of Yaoi
Provides a short timeline of the yaoi genre.
Yaoi-Wikipedia
An entry on yaoi
