The very VERY few times I've seen women in porn, they've moaned so loud that it was frankly comical, and I had to turn off the sound. I found it ludicrous. Shut the fuck up! I couldn't help thinking. It was so obviously overperformed and fake that it was just annoying. I can only assume that maybe straight men like this and the women are just playing up to that?
In gay porn, of which I have seen a lot more (and I mean a LOT), I've seen all varieties. Some who keep quiet, some who make pleasant standard moaning noises like a normal person would, some who gibber and wail and go completely insane (which is also annoying), and some who manage to not react even when they're getting the washington memorial rammed up them.
I've also been on gay porn sets where the director had to remind the performers to make noise because they were being too quiet, and I'm also familiar with porn films where the moans are so obviously looped and the same 10 seconds of audio are played over and over again like they think we wouldn't notice.