Depends on what you mean by porn tbh - I enjoy watching, for example, sex scenes in movies or tv shows when done well, and reading sex in fiction that is well-written and character-driven e.g. some fanfiction. I don't think I'd enjoy it with a partner - it's something for me, to give me pleasure or to get me in the mood. I would have no problem with a partner having similar interests, conducted in their own time.
What I have seen in my research-driven forays into the main free porn sites, though, and what I hear about things like OnlyFans, is vile - lacking any beauty, respect, emotion, or creativity, anything that could stimulate me sexually - just stock phrases, aggressive imagery, and actual violence against women (choking, slapping, rough sex in every orifice, name-calling) as standard. I am utterly repulsed by that and would have a hard time being attracted to anyone who gets off on it.
As far as I know my partner doesn't watch porn, but I wouldn't ask as I'm sure I don't want to know the answer. According to the internet 'all men do', and based on what is prevalent all men are being very damaged by the free availability of such horrible, soulless stuff.
Police believe that the astronomic rise in images of child abuse being circulated is not because there is some inexplicable growth in paedophilia (or that levels were always this high and the internet just leaves a digital 'papertrail' that's easier to uncover), but that men are so desensitised by the readily available and habitually extreme nature of internet porn that they need the material they consume to break bigger and bigger taboos as time goes on to get the same thrill, and child abuse images are the final frontier of that. If that isn't the best argument I have heard against porn (or most of it), I don't know what is.
I also find the idea of watching porn with a partner so deeply, deeply cringeworthy I can't even. I mean, at what point does your sex life become so stale that you need to watch other people going at it to feel aroused, when your actual partner is there? At what point do you so lack imagination and attraction to each other that you need props, artificial visual stimulants, etc etc? I'd honestly rather stop having sex altogether than let it limp along like that. That would be the moment I'd say you need to get right back to basics and CONNECT with the living human being in front of you, not add in more layers that bypass and cheapen that connection even further.