First and foremost, a little history: the Osaka Prefectural Government keeps a list of "harmful" manga publications, which are blacklisted against sale to minors. In 2007 they swept 70 stores to pull some of these magazines; in 2008 they added another six shoujo manga to it-- every time I've ever heard of the matter, it seemed that considerably more focus was being paid to shoujo works than to those aimed at boys.

Not in Osaka, boys!
Earlier this year, in the wake of all the talk of loli bans in Tokyo, Osaka began considering something similar, and also
specifically mentioned boys love manga-- the uber-popular subgenre of shoujo that features boys in love with boys, largely by and for women. And the latest piece of news on the matter?
ANN reports that eight BL manga have been added to the "harmful publications" list.
So, does Osaka just hate female readers, or are they just more concerned about the corruption of their young women than of their young men? It seems to me that given Japan's severe population issues-- super-low birth rate! --they'd be more inclined to enourage women to get in touch with their smutty selves.
But hey, what do I know? I'm just a girl.
Me, I think they dislike the gays. And are prudes with sticks up their asses (depictions of which you can no longer sell to minors in Osaka - Aha! Now we see why they're doing it! ;P)
It's definitely going to hurt what BL we receive, simply because harder stuff won't sell as much now.
I don't even read or care fo BL. However, I do support its sale, creation, and distribution along with any other genre of manga. If Osaka is banning this material then all these fickle governments that are looking for excuses (US included) to ban the material as well will surely follow suit. Since when was a "book", essentially, so harmful to society and people that it can't be owned or read? Personally all of this is a bunch of shit that is overblown and people complain to complain.
P.S. People who compalin about anime and manga should be forced to read and watch it. Psychological torture/warfare is still ok, right?