I was under the impression that porn sites are among the leading sources of malware infections. Or at least they were at one point in time, I don't know how well microsoft or whoever keeps pace with the latest browser exploits these days.
Either way, the point is, I would never open one of those sites on the same computer I trade on. And if one of my stupid friends wants to use my computer to check their stupid facebook, and later I find porn sites in the history, I never let them use my computer again, period. Consider it a security risk if that helps.
Additionally, I don't live alone, and my office is openly visible from my living room, which in turn is openly visible from my front door, and my front door has a large window in it. Point being, I can honestly say that I never look at internet porn, a complete lack of privacy assures that. You could try a similar setup, might help.
By the way, hello everyone, first time poster here, and yeah I know, a porn addiction thread, hell of a way to make a first post.