If you use your mind with porn to give yourself a cheap thrill and you keep doing it and doing it, the mind is a plastic thing and you gradually rewire yourself. Lots of folks get hooked on the stuff and it gradually takes over their lives. It isn't just an increasingly damaging waste of time that can end leaving people sleepless and in despair, but it can tragically lead to appetites to be fed in the real world. I know a number of folks whose lives have been severely damaged by porn. Respectable porn would including providing new users with lots of real stories of lives destroyed by porn along with technical explanations of how porn can slowly rewire your mind, such that undoing the damage is a slow very difficult process of years. Responsible porn is good information on the risks.