Pornography is addictive like alcohol and drugs, and even more so.
The material provides a very powerful sexual stimulant or aphrodisiac effect, followed by sexual release, most often through masturbation. Material which presents massive amounts of misinformation or gross distortions about human sexuality. Sexual activity with animals. Sexual activity that contains bondage, torture or violence. What raises community standards is prosecution of material that meets the elements of the crime, not necessarily winning the trial.