this is all about male entitlement
What?! 
Men watch porn because they can. Because they want to. Because it’s there. Because they can watch whatever the hell they like. Not because they feel entitled to it. What happens when women watch it?? Is it suddenly “female sexuality empowerment”? Because I’d be very surprised if you still labelled it “female entitlement”.
we've gotten ourselves into a situation where even questioning whether this is a reasonable thing to do when you're in a monogamous relationship with someone is treated by some as controlling behaviour
But it IS controlling behaviour! A woman telling a man he can’t wank to porn is trying to control what he does with his own body and trying to control what he watches. If a man came on here and posted a thread saying he was upset because his girlfriend had been pleasuring herself to porn or something similar and wanted her to stop he’d be bashed to hell and labelled controlling!
The problem isn’t the man watching porn. If he has an addiction to porn then yes, there’s the problem. But in circumstances like this, him watching porn isn’t the problem. The problem is the girlfriend not liking it for the reasons she stated - She makes it known she thinks he shouldn’t watch it because she should be enough for him, because they have sex almost daily and she wears nice underwear for him - which is great! But expecting him to not have a wank over porn because she does all that is the real issue here - OP it doesn’t matter how much you have sex how often you wear nice underwear etc your partner is always going to find other women attractive, he’s always going to want time to himself to have a wank. And ya know what? THATS OKAY! Because as you made clear it obviously isn’t affecting your sex life. So where’s the problem??
My partner and I have sex almost daily yet I still like time to myself and quite often that time to myself involves porn (I’m a woman btw) and the same for him. I would only ever question things if he started rejecting me for porn. I don’t have a problem if he suggested something because he’d seen it on porn - what’s the difference between seeing it on porn or reading about it on the internet? It’s only a suggestion.
You’re entitled to dislike porn. You’re not entitled to expect him to stop watching it simply because of jealousy because that’s what it boils down to