Porn Addiction in the Christian Community. Why are the rates of addiction so high?

http://www.alternet.org/personal-health/porn-addiction-christian-community-why-are-rates-so-high

In a piece titled  “I’m a Christian Addicted to Porn” for the magazine Christianity Today, Shaun Groves describes the torturous shame he felt after enjoying sexually explicit media: 
“The pleasure faded. And in its wake I fought pounding waves of regret and guilt. I felt a million miles from good, a billion light years from God. I'd often think back to how I saw that first picture of a naked woman. I had used a stick to keep it away from me. I felt like God had the stick in his hand now, poking at me from a distance, trying not to get any of me on him.”
Joshua Grubbs watched students go through similar anguish during his undergraduate years at a conservative college. So, as a doctoral candidate in psychology at Ohio’s Case Western Reserve University, Grubbs was excited to explore the link between religious values and perceptions of porn addiction. 
Grubbs' research team surveyed three representative groups of adults (including undergrads at both a public and a religious university) about their viewing of adult material over the Internet. The study, Transgression as Addiction, concluded that "religiosity and moral disapproval of pornography use were robust predictors of perceived addiction to Internet pornography while being unrelated to actual levels of use among pornography consumers."