"Why stop yaoi?", you ask?
I think the reason behind this is simple: yaoi is downright disturbing. Honestly, if you look at most, if not all of the yaoi out there, at least one of the guys looks like a girl anyhow, so it's little more then a normal relationship to the emotional point-of-view that women have. However, men usually look for the sex in a relationship, and what do we see? Two guys having sex, which is, in my opinion, disturbing. Now, i'm more accepting of yaoi (where one or both of them look like girls anyhow), then straight gay porn (in which the guys are either the stereotypical clean shaven type, or fat and hairy, both of which is sickening.) But this still doesn't change what it is: two guys having sex. Now, while yuri is also in equal ammounts of unnatural, i consider it better, as i imagine women to be more accepting then men, and can ease into homosexuality better then men. That and it's damn hot. Finally, if you attack this as being hateful or stupid, you have to remember it's still free speech, and if any of you pansys are gonna fight this, i'm willing to defend it tooth and nail.