Hate to break it to you all, but yaoi doujinshi 
is written for women by women. ^_^;;

It's very very very popular in Japan, and yaoi 
stuff isn't really about being "gay", and men 
almost never have anything to do with yaoi stuff 
at all. It's a girl thing, about guys ^_^;

This is not my area of expertise, if you are 
really interested in this check out:
http://www.aestheticism.net/visitors/index.htm

misa