Black market pornography is big
From Danwei’s A brief history of Chinese porn:
Despite the worlds most sophisticated monitoring and filtering software arrayed against them, tech savvy Chinese jump the Great Firewall with ease. For those less computer literate, pirated porn DVDs and VCDs are easy to buy if rarely on display. Porn is big business on the black market. In one 2008 bust in Shanghai authorities confiscated over 8,000 DVDs on their way from Guangdong. Internet crackdowns are frequent; the most recent was launched in 2009, with over 60,000 websites confiscated and shutdown by the authorities. Pornographic materials remain easy to acquire however, through p2p services, torrent sites and numerous websites that have escaped the censors. The futility of the authorities’ attempts to police this area was illustrated by the Edison Chen scandal that broke in early 2008.