The argument that if porn was fine it would be used openly, which someone made above, is a bit facile IMHO.
Wanking is not done in public, along with defecating, self-abuse with sex toys, and farting (mostly). The day it is, we will see whether men want to upfront about porn use. Meanwhile, they are pretty open about it with each other, AFAICT. If they were as open about it with female workmates, they would be in front of an employment tribunal.
It also seems a bit odd to argue that because in some cases porn is forbidden for religious reasons, it ought to possible to forbid it more generally (paraphrasing from upthread). Well, yes - but look at where. Countries that forbid porn are always totalitarian and repressive in other ways, unfortunately, and usually notably so towards women. In Saudi Arabia the display of an ankle is considered indecent, so it is surprising to hear the suggestion that we should look to such places for guidance.
I suspect the reason men are fine with porn is because they perceive the participants as prostitutes. Technically, in having sex with all comers for money, that's what they are, and it's even what the word means. As such, they are seen to be volunteers, not victims. There must be plenty of equally economically desperate women who aren't attractive enough to feature in porn, and yet who somehow get by. There must also be a lot of attractive women in need of money who find other ways than porn to get by. They get jobs as cleaners, for example. So what, exactly, drives the decision of some attractive women to feature in pornography? - rather than being front of house in a hotel, or working in a car showroom, or somewhere else where being attractive and female is helpful?
Perhaps one would have to ask minor slebs whose first career move always seems to be to get their kit off for a lad's mag. This seems to me to be the first rung of the same ladder.
A lot of it porn certainly very unpleasant, and a lot of it looks horribly unhygienic. But the odd thing about porn as someone mentioned upthread - a bloke I think - is that it is free. Those who are using it for nothing aren't going to have any input to the content, because if they dont like it, they can't exactly take their money elsewhere. The misogynist nature of it must be the result of the tastes of those who do pay for it, which I think is probably very few and being a minority by definition weird.
I think all men have looked at it and perhaps all have gone through a phase - certainly post-internet - of looking at it quite a lot. I also think they stop though exactly because the women in it look nothing like real women. This is probably why Ovid stopped wanking over Greek pottery in the end.