The study does not specify the exact amount of exposure required for the behaviour to be considered an addiction. It does, however, talk about the effects of habitual behaviour on neuronal pathways. This means that regular or repeated consumption of pornography is enough to rewire your brain, even if you are not addicted, per se. And that is not difficult to believe when you listen to, or observe, people. I mean, just look at some of the nauseating posts in this thread. People being totally vulgar and thinking it's the most normal thing in the world. In any case, many of the points I brought up have nothing to do with addiction, but with pornography itself; and, no amount of regulation will solve those issues. The "consenting adult" argument is a tired cliché. People consent to all kinds of unhealthy behaviour. This planet is "the mental institution of the universe," after all.