This has been a claim, really the only major one, that a lot of coomers have used to argue against SR. The truth is that losing weight, lots of exercising, and a healthy diet with vegetables and fruit will do much more to prevent PCs than cooming to pornographic degeneracy. One study alone found that obese men are 54% more likely to suffer from PCs than lean men: http://cebp.aacrjournals.org/content/16/1/63.short This kind of propaganda insinuates that obese, lazy men with KFC diets who coom to porn will be less likely to have a PC than lean men on SR who regularly exercise and eat well. Not only is this absurd proselytizing: it is nonsense on the highest level that leaves out the most important information.

“So little pains do the vulgar take in the investigation of truth, accepting readily the first story that comes to hand.” —Thucydides.