I see it this way:
Prn is deliberate temptation and mental cheating. To use it not only harms the person cheated on, it harms the person using it, the people involved in the industry and everyone who has to grow up exposed to it. Using porn creates an incentive to produce and publicize it, increasing the number of people who grow up surrounded by it. It desensitizes and addicts, causing an increase in perversion. It causes a desire for what is unattainable, for otherwise it wouldn’t sell. One can’t sell what can be had free. So the bodies are distorted further until they bear no resemblance to healthy human bodies, the activities shown are increasingly unrealistic until they are simply not possible or until extremely dangerous, the language becomes increasingly evil and degrading until it affects the thought and speech habits of the user, which spread through society, and it becomes impossible to escape the artificial culture porn invents. Meanwhile, avoiding using porn is a matter of having something else to do. A married man should have plenty to pass the time. If he’s viewing or reading porn he is cheating and using time he owes his family to do it.