From this newscientist article: http://www.newscientist.com/article/dn16680-porn-in-the-usa-conservatives-are-biggest-consumers.html and here is the pdf of the study

However, there are some trends to be seen in the data. Those states that do consume the most porn tend to be more conservative and religious than states with lower levels of consumption, the study finds.

“Some of the people who are most outraged turn out to be consumers of the very things they claimed to be outraged by,” Edelman says.

The biggest consumer, Utah, averaged 5.47 adult content subscriptions per 1000 home broadband users; Montana bought the least with 1.92 per 1000. “The differences here are not so stark,” Edelman says.

Number 10 on the list was West Virginia at 2.94 subscriptions per 1000, while number 41, Michigan, averaged 2.32.

Eight of the top 10 pornography consuming states gave their electoral votes to John McCain in last year’s presidential election – Florida and Hawaii were the exceptions. While six out of the lowest 10 favoured Barack Obama.

States where a majority of residents agreed with the statement “I have old-fashioned values about family and marriage,” bought 3.6 more subscriptions per thousand people than states where a majority disagreed. A similar difference emerged for the statement “AIDS might be God’s punishment for immoral sexual behaviour.”

“One natural hypothesis is something like repression: if you’re told you can’t have this, then you want it more,” Edelman says.