If as a society the chinese dont want porn, why cant they make that choice? The US sure had issues with porn back in the day, and continue to do so with many other types of porn.
(I'm posting this from Shanghai, using a Chinese internet connection without a VPN, so I hopefully have half a clue about what I'm talking about.) China as a society doesn't seem to have a problem with porn. It isn't generally on display, but you can ask for "huang DVD" at plenty of shops and be shown a selection of skin flicks. Every night someone comes through this hotel and slips business cards advertising escort services under everyone's doors. Relatively few web sites are actually blocked, I mean 4chan with its rampant porn, gore, hate and conspiracy theories is fully accessible for fuck's sake. It's nowhere near as restricted as westerners seem to imagine.