The mainstream and sexologists seem to have a blind spot about the physical addictiveness of pornography for many people. People assume that only substances can be physically addictive. In fact, however, the brain is set up so that activities can produce an intense addictive dopamine cycle in the reward circuitry of the brain not unlike a drug does. Think of gambling.
One way to try to correct this mass misperception is to bring to light more examples of the physical withdrawal symptoms that accompany porn withdrawal. That makes it very clear that porn can, indeed, produce physical addiction, even though it isn't a substance.