A Brief History of Yaoi

Shaenon Garrity over at Graphic Novel Review writes an introduction to Yaoi, the Japanese manga that features romance and/or sex between male characters, and is apparently one of the most popular manga genres in America, especially with teenage girls. Shaenon does a great job of providing context for this genre in one two three parts so far.
In the 1980s, shonen-ai collided with the growing popularity of doujinshi, comics self-published by manga and anime fans, and yaoi was born. The doujinshi scene was dominated by female artists, and same-sex romances soon became the biggest and most popular genre.