If you resolve to stop it, then you have to deal with that problem that everyone thinks different things are harmful.
Some people honestly believe that porn is harmful to society and the individuals within it. It's not enough to just say "it's not harmful" because they believe it.
And I can't even say that it's not. Promiscuous sex transmits diseases that absolutely do harm people, and there are psychological aspects that I'm not even knowledgeable enough to start giving an opinion on.