Porn study couldn’t find a man who hasn’t viewed porn
http://www.gmanetwork.com/news/story/252909/scitech/science/porn-study-couldn-t-find-a-man-who-hasn-t-viewed-porn
To simply say that “X” percent of men have seen one of these sites is the equivalent of comparing someone driving 75 mph in a 70 mph zone with the guy going 120 mph. All sin may be equal in the eyes of God but not all crimes are equal on Earth.
There is a difference between someone that has seen it, maybe even looked a site up and those that go there regularly or someone who did but has stopped. There might even be a few legitimate reasons to have looked at those sites
For example, I was tasked several years ago to create a list of porn sites that would be blocked on a university web site. Thus I have spent hours searching for porn on the internet. I created a document that was about three pages long with the various URLS but I doubt you’d say I habitually view porn.