I will try to give a physiological explanation:
Nature has designed (evolved) our brains to produce dopamine everytime we achieve an action for food hunting or reproduction (two important elements for survival). Food is abundant and hence no effort needed to satisfy the hunger. Our porn industry has successfully exploited the reproduction factor by placing a substitute in the form of P with many different images changing all the time (causing Coolidge effect). For the past several years (or decades in some cases) our brain nerves have established certain pathways to produce large amounts of dopamine super-fast. According to Yogis: "...separate threads form a strong rope, one thread entwined with another building upon each other..."
What is the solution: Break one thread at a time until the entire rope breaks apart.
So, to breakdown these nerves, feed them as little electrical activity as possible. Removing P's and P-subs will drastically reduce the food for these nerves. However, brain cannot differentiate between imagination and reality - same signals are sent through those same nerves in both cases. So, removing P thoughts will further reduce the "food" for those wrongly wired nerves.
There needs to be a secondary action in parallel. Those nerves that do not get the "P" food and get starved, need some other dopamine producing alternate foods. Depending on the individual and their circumstances, the alternate can be a passionate hobby, sports, career, financials, fierce political debate, or family, etc. Unfortunately, it will not produce that large doses of dopamine super fast (atleast not in the beginning). So more sustained long term campaign is needed. Some very successful people figured this out at very young age and wired their brain for those alternate thoughts that produce the same dopamine. Eg. Steve Jobs, Mark Zuckerberg, Elon Musk for their technological passions.
Imagine, if your brain nerves were wired for technology or artist, politician, scientist, doctor, lawyer, social worker, accountant, or any other chosen path) instead of P, you would have been the Steve Jobs in that field. I am sure one of you on this website could have been a 'Steve Jobs' if not for the P

. You still have time!