Excellent response. I wrote a book on this subject, and the sex addict is no different than a drug addict.
As with all addictions, progression is the real danger. An extreme case would be Ted Bundy. He was executed 1/24/1989 for at least 28 murders. He apparently confessed to 50, but some believe it was a 100 or more. His home life was a Christian one, with good parents and a stable environment, but one day he found a magazine. He said this about his family, "I grew up in a wonderful home with two dedicated and loving parents, as one of 5 brothers and sisters. We, as children, were the focus of my parent’s lives. We regularly attended church. My parents did not drink or smoke or gamble. There was no physical abuse or fighting in the home."
The addict will find satisfaction in the small doses (Pictures/magazines/film) at first. These will suffice in the beginning, but soon the pictures and self gratification don't soothe the pain any longer; the acting out stage will eventually snare the addict. He/She will begin to need more to get the same affect. In other words, tolerance numbs the current experience so the individual must find a deeper experience for the same affect.
Ted Bundy told James Dobson before he died that the society which allowed the very magazines he found in a dumpster, starting this addictive trend, was now putting him to death. He said this, "As we have been talking, there are forces at loose in this country, especially this kind of violent pornography, where, on one hand, well-meaning people will condemn the behavior of a Ted Bundy while they’re walking past a magazine rack full of the very kinds of things that send young kids down the road to being Ted Bundys. That’s the irony."
Here is a link to the interview;
http://www.pureintimacy.org/piArticles/A000000433.cfm
Here is a video of that interview. This will break your heart.
http://www.youtube.com/watch?v=jAHgJFPcOvY