Quoting from the article below:
"The rankings were based on the quantity of DVDs purchased, rented, or streamed; adult entertainment stores per city; rate of porn searches on the internet; and the percentage of households that subscribe to a channel that shows soft-core porn."
Read more at http://www.christianpost.com/news/whats-your-citys-smut-ranking-80332/#4GI8zLxoxxJv1ZBC.99
"A ChristiaNet survey says 50% of Christian men and 20% of Christian women are addicted to pornography. What's even more alarming, 37% of pastors say cyber porn is a current struggle for them."