Wait...just because of a bad apple? Come on! Google is education these days.

youtube is also banned in china....

But what China is doing has nothing to do with porn.  They are terrified that the Chinese people will utilize the internet as effectively as the protesters in Iran.  Since China has legalized prostitution China really has nothing to be proud of in terms of what image of women it promotes both domestically and internationally.  It shows up on AnD, too.  More than one blog I have read by a male AnD artist has featured a Mainland massage parlor.  If it was really about offensive adult internet sites, I think you'd see some vocal women involved in this campaign.  China still has a long way to go--I don't think I've ever heard of a Chinese feminist.  In a country of 1.5 billion, that is rather surprising.