 Because it's politically incorrect. It's not very sex positive to say that this is an addiction, but it obviously is. In part, one doctor says that it is because it escalates. It's not like you just look at porn and then you're good. You keep seeking out harder and harder forms of it. Like with a drug, you start out with a soft drug, and then if you keep doing drugs, you seek out harder and harder drugs. That's the problem.