@GoAwayCat
In very rare cases. It can potentially lead to a dangerous path that maybe more extreme material or acting out fantasies with prostitutes. Especially on stag do's or work trips. Most guys I know get the the odd hand job during a massage or do this
In very rare cases... but most guys you know pay for sexual favours? 
And if you have moral and ethical standards of behaviour you should turn a blind eye to your partner not meeting them?
The 'every man does it and if he says he doesn't he's lying' trope is standard gaslighting stuff. Every man is a unique individual with their own thoughts and opinions and standards. Just like every woman. It's totally unacceptable to make out that anyone who has an issue with pornography should just put up and shut up, that it's inevitable and that people who have boundaries in relation to it are deluded, controlling or anything else.
Pornography harms. Even your standard run of the mill shagging has the significant potential to involve legal and moral consent issues in the production and distribution of it, never mind the effect on those accessing it. So no, I won't be turning a blind eye to it because A Man has said it's ok and everyone does it, his wife allows it, and anyway people do much worse.
I'm not saying turn a blind eye to cheating.
I was referring to the pornography, which as I'm trying to point out, is fairly wide spread and common.
So my suggestion was - assume your guy watches porn - if it's a deal breaker. Bring it up. Ideally at the begging of the relationship.
I guess to use another example -
If you went out with a guy who said he was Vegan and your where Vegan - but he was secretly eating meat - you'd rightly be upset and because he lied to you.
On the other hand, if you went out with a guy and food never came up and after a number of years you found out he was meat all a long.
And you where Vegan - and he's not. He's done nothing wrong in that case.
That's the point I'm trying to make - despite it being unethical, wrong and immoral - most men watch porn - and some women do.
Most men watch porn - but equally 5 minutes after the act they would feel disgusted and ashamed by the act. So while their are ethical options, much like free range chickens, the chicken stills end on a plate.
The cheating is the line that shouldn't crossed.
(for the record - I didn't cheat either emotionally or physically - I never have)
Sadly this line often crossed by men and women ...
The Stag party thing only really happens in places with red light districts. Not really by guys in new relationships. But guys in long term relationships find the sex life goes away or it's just the Coolidge effect and they think they have a free pass.
en.wikipedia.org/wiki/Coolidge_effect#:~:text=The%20Coolidge%20effect%20is%20a,but%20still%20available%20sexual%20partners.
Maybe what is underestimated is how much men think about sex - with different partners on a daily basis - and how visually stimulated they are.
Probably one of the main reasons you see certain social medias grow massive followings and onlyfans has seen such a massive growth.
My original point to the OP was that he needs to shut the door and be more careful. I understand why it would upset her on lots of levels.
But I was shocked that he she was surprised from porn - and some of the comments on the thread.
Sorry if I over shared. (maybe I should be sorry for the partners who will get cross examined right now)