There's nothing wrong with your choice to indulge, but it's also important to understand that women don't think like us, and most don't want to accept and/or understand that a man can cherish and desire his woman and also jerk his pole to randoms when he doesn't have access to her.

Women are often illogical when confronted with the sexually dominant aspects of men's nature. To them, sex and desire are almost always directly tied to emotion and intimacy. It's quite difficult for them to separate the two, which is why situations like these are often so stressful to navigate, and why men tend to find themselves stuck between a rock and a hard place when trying to come up with a solution.

To be clear, there's likely no win-win scenario for you. You're either going to have to give up porn, pretend to give up porn and still stroke it in private, or end your relationship and find another woman who will consider your porn use in a more logical manner, which isn't common.

What's funny to me is that it's extremely likely that if you were a woman and made a post complaining about your SO's disgust and uncompromising stance regarding your porn use, many comments, and especially comments made by women, would have a more patient and sympathetic tone than might be found in the opposite case, and would also possibly demonize your SO for being "controlling, manipulative, insecure, ignorant, and/or difficult."

Women will often punish men, even the ones they're supposed to be building enriching futures with, when certain factors in a relationship (like porn use, for example) don't directly contribute to their satisfaction. Yet they'll also punish men when similar circumstances they engage in are placed under scrutiny.

Women tend to want their cake and eat it too, which is not only impossible, but usually does nothing but damage a relationship in the long run by way of confusion, frustration, resentment, disgust, and in due time a complete lack of respect.

In my opinion (if you're open to the idea of kicking porn), asking your SO to provide photos and videos of herself to replace it is a logical thing, but she may refuse to do so in an attempt to punish you or control you with whatever sexual access you'll get tossed your way when you eventually "behave" or are "forgiven."

When a woman ridicules, restricts access to, and/or dismisses your sexual needs, you're not dealing with one who has your best interests at heart. You're dealing with a selfish, vitriolic person who finds pleasure in your misery: never the sort of woman to be considered a permanent part of your life.

With all that said, it's also vital for us to acknowledge that, just like men, women are free to have expectations and exercise boundaries in any relationship. There's nothing wrong with you wanting to watch porn. However, there's also nothing wrong with a woman NOT wanting you to watch porn. What's wrong is when she expects you to behave unrealistically, punishes you for expressing a desire to communicate and compromise, uses ultimatums to unfairly get her way, and then refuses to acknowledge the hurt that surfaces when double standards are created and enforced.

To the younger men in fledgling relationships, understand that situations like these don't often change when you get older, so, if you find yourself dealing with this now, take it seriously and be honest with yourself and your other half about why you both do the things you do and think in the ways you do (that includes the reasons for your porn use, its frequency, and how it may or may not influence your day to day life, positively or negatively).

Some of your relationships may end because of circumstances like these. Sometimes the fault will be yours, and sometimes your other half will reveal herself to be an undesirable monster. Regardless, in each case, do your best to build the habit of not hating the women who put you through the ringer. Although at times they can be unpleasant, ungrateful, and selfish, they're not evil. Many of the things that make them that way are not inherent to the gender. They're taught. Always keep that in mind.

And never forget that the best relationships are a balance of patience, compromise, communication, and respect.

All the best.

TL;DR

Your porn use isn't the worst thing in the world, but your SO may demand that you stop, which is her right. Come to a clear conclusion why by communicating openly and take appropriate action, but don't allow her to dictate and enforce strict preferences, rules, and boundaries when you have none. The best relationships are a balance of patience, compromise, communication, and respect.