Make it a boundary, and if it doesn’t suit him, find someone better. Do not lower your boundaries in a bid to look unfazed/ giving/ cool.
Sex is bonding, and to feel like porn ruins that bond, hurts you or makes you insecure is part of your design as someone to whom sex is a part of love. You’ll get all sorts of opinions on here from all sorts of people- many who don’t have the mindset you do.
I was with sonoene for years and tried to fulfil all his fantasies, but once they cross your boundaries they keep on pushing and wanting more and more, they also tell themselves that it doesn’t bother you in the slightest as you let it be part of your sex life. As someone said, porn is for the male gaze, Try choosing a video of a man wanking an moaning and see how long he wants to watch that, especially one with a bigger cock than his and fitter body. Why subject yourself to what he himself would be unlikely to want to engage with, something that would lower his attraction to you most likely. My ex ended up wanting porn all the time, I could never get him alone in the end, it made me deep down miserable as for me sex was about love and intimacy and the passion we started out on, it seemed got lost in his lust for many other women.
I’m so glad I dumped him in the end as I honestly started to hate him and despite having a very high sex drive, I started to lose my drive for him because I knew what it would end up being about. He didn’t just want porn, he wanted to me talk to him about other women and what they look like and what they’re doing to him etc. despite me dressing up and doing all sorts with him, it seemed he just needed other women also in the mix. There is a problem with porn, not just because it’s exploitation, but for men who are focusing their attentions elsewhere it can ruin the romantic bond. You have to decide what you want, not what a load of random women on here would tolerate. Be aware that once you go down the porn route, if you then take it away he will likely resent you, and if you don’t take it away, then its going to be an expected part of your sex life together.