Allison Vivas writes on
http://2010.newsweek.com/top-10/sex-scandal-details/peter-cook-porn-problem.html :

Three thousand dollars a month is a lot to spend on pornography by any measure and in any era, but it’s a particularly egregious sum in the Internet Age, when there’s a no shortage of free porn readily available online, and even premium-quality new releases are available on the cheap.

That Christie Brinkley was this man’s wife makes it triply insane. Cook apparently got into chatting with “cam girls”—models who perform live via Webcam, and interact directly with their viewers. While porn is cheap online, chatting with cam girls is not, and with sessions that run up to several dollars per minute, it can add up quickly over time, especially if you become a “regular” for one or more of these girls. Even so, $3,000 a month is just pure, excessive indulgence.

I doubt the average porn addict (and no, there aren’t many of those compared with alcoholics, drug addicts, or even food addicts) spends no more than $150 a month. But this story isn’t really about porn. It’s about selfishness, pure and simple. It was selfish of Cook to have cyber-affairs. But mainly, it was selfish to indulge in all that self-pleasuring.