It is time again to add some wisdom here.
The science of addiction has great articles on this site to encourage us and to use the mechanics of science as a tool. In my case it is a God given tool, for others, its just science.
As I finish up my psych grad degree in the midst of years of unemployment, one thing is clear; does the thing you do (PMO, or drugs, etc), cause distress? I assume it does. One should avoid distress and when porn is uncontrollable, we must reduce that exposure as much as possible. I myself see a few explicit pictures and drawings on a certain picture site I frequent, that also has architecture, nature and comics as well. I produce little distress by seeing those pics and yet some here would not endure such temptation. I say this in light of my past when viewing porn for the sake of just viewing it (no masturbation) took hours from my day. That alone is distressful. I longed to regain control of my time. I wrongly assumed that replacing porn with Bible reading was a solution. I then realized that the human brain in me needed excitement in baseline stuff. Allow me to demonstrate; the house was mine to manage while my wife was away. I needed non porn related things to do, so I developed interesting projects that included this web page, LinkedIn and some others, wash needed to be done, fitness, kitchen cleaning, messy garage, paperwork for my special needs kid and in cases where the weather was good I simply got outside. Remember when you are alone, it is not good, my adult with autism helped by just being around. These simple projects were never done and provided enough simple brain stimulation to keep me out of trouble.
Remember, thinking about staying out of trouble (porn) is a conscious habit where you want to avoid porn and are thinking about avoiding porn, but really, you eventually get a proper dose of brain stimulation and eventually are not thinking about porn at all.
Therefore, when I get on LinkedIn, my mentality is not to find stimulating pictures of nudity but to look at profiles, business and read articles that make me a better person professionally. This practice removes the exercise of avoiding porn while avoiding porn altogether. If I deviate and then look at a few explicit pictures, I must do so quickly lest I forget where I came from. The goal in that case is to go back to the article I was on such as an article of business or other subject. Avoid the feelings of guilt that accompanies a lapse in judgement or relapse as we call it.
Examples of my own struggles can be given on request as questions, but telling a long list of guilt-ridden failures will not help anyone here.
As Christians we must realize that this is a war. Porn is one of many battles and other people battle their own problems of sin and sanctification. If we keep this in mind, the clever temptations given by our enemy can be fought and won with little cost. Prayer is assumed here, since the Lord wants you to speak to Him and to lay out your weaknesses plain and simple.