That's because he's blind and can't see the stuff. If he saw "Two Girls One Cup" he would ban the stuff all together....
http://www.nypost.com/seven/02152009/news/regionalnews/paterson_wants_to_tax_porn_155333.htm
http://www.nypost.com/seven/02152009/news/regionalnews/paterson_wants_to_tax_porn_155333.htm