One of the biggest mistakes porn addicts make is confusing their use of porn, their porn preference, with their actual sexuality.
Sex is not porn. Porn is not sex. Pretty obvious when you think about it, but, especially for newbies, somewhat counter intuitive. Porn is a tool, a button. We push it to get a dopamine rush. Oversimplified, yes, but perfectly adequate to understand the problem. It is the dopamine rush that we love, and the dopamine rush we become addicted to.
So, I see a lot of guys here saying "I am addicted to category X porn", X being whatever category they are using to get off at the moment. Those guys are wrong, as is anyone reading this that thinks they are addicted to any "category" of porn. Again, porn is not addictive; it is the dopamine reaction it leads to that is addictive to us. This is important to understand.
The dopamine reaction is 100% above the belt, a brain reaction. Sex, on the other hand, involves actual physical contact, and is, in significant part, a below the belt activity. RGT, you talk about making a "transition" from some categories to others. Actually, I would like you to think of it the same way, but use some different words that are a bit more accurate.
When it comes to abusing the human brain's dopamine reward system, about the time we hit puberty, we become very sensitive to a dopamine high. This translates to us all becoming very fascinated with sexual thoughts. That has been our reality for a long, long time. But, when we invented HSIP, we invented a new way to have new and novel sexual thoughts, infinitely. This means we can have new, novel, sexual thoughts, infinitely, meaning we can have a never ending dopamine rush, for the rest of our lives. That is what makes the addiction possible.
Understand, porn addiction is arousal addiction. Arousal addicts, unlike substance addicts, do not need "more" of it, we need "new and different" of it. Both types of addictions experience sensitization and desensitization. When a substance addict desensitizes to thir drug, they need more of their drug. When an arousal addict desensitizes to their arousal mechanism, they need new and different. When you talk about "transitioning" from one category to the other, what you are describing is desensitizing to one category, become disinterested in it, and sensitizing to another "new and different" category, or finding it interesting. For a lot of people, if they are addicted long enough, over time they "move through the categories" in that never ending patter of sensitization and desensitization. The new category that becomes interesting to them usually has a bit of shock value to it. That means a lot of people escalate from vanilla porn to fetishes, or, in the case of a number of persons, gay porn. Remember, the porn you use to obtain your dopamine high has nothing to do with your actual orientation, and so that escalation can happen regardless of your orientation.
If this describes you, it means you have watched enough porn, for long enough, that you desensitized to whatever vanilla porn category you started with, and you have sensitized to gay porn. If that has happened, it is no tragedy, but the fix is to quit using porn to get a dopamine rush. You have to rebalance your brain, train it, teach it, to exist without using artificial sexual stimulation to obtain a dopamine high. Once you get back to, more or less, pre porn levels, you can explore your sexuality, as opposed to what porn button you need to push to get your dopamine high. I usually recommend the hard 90, 90 days no porn, and avoiding sexual thought as much as possible. Many have done that and reported it helps.