The Governing Corpse never seems to catch on that most of the sexual problems JWs experience are a direct result of the unhealthy-to-the-point-of-diseased mentality that it itself has created in JWs. This attitude originated during the Russell era, and was reinforced greatly during the Knorr era, largely, I think, due to Knorr and Franz's pathological views of sex.
Franz was never married and had at best a theoretical notion of what sex is supposed to be. He actually wrote a Watchtower article comparing "women in heat" to "cows in heat" and warning young men against their evil machinations.
Knorr was hung up on masturbation -- obviously he suffered severely from this 'problem' -- and seems never to have consumated his marriage. Knorr would actually sequester new "Bethel boys" in a locked room and give them his "don't touch it" speech, telling them that when they "went to the bathroom" they shouldn't "touch it" for fear of arousing illicit desires leading to masturbation.
With a legacy of such sick "spiritual teaching", it's no wonder that so many JWs have such an unhealthy view of anything to do with sex, including pornography. Rather than these things being part of a healthy, normal view of sex, the JWs have an unhealthy fascination with them which leads to all sorts of problems, including marital trouble. Instead of viewing pornography as no big deal, they view it as a big bugaboo, which leads many of them to pursue it far more than most normal people would.
AlanF