The girls don't need to watch porn. They are exposed to the posturing and attitudes it shapes via so much contemporary popular culture.
Back in the very early 00s, I chatted civilly/jokily to two guys at a bar in my town on Halloween night (I was with a group but I was up at the bar alone getting a couple of drinks for me and my bf or one of my friends, can't remember). We were discussing each others outfits and we mustve touched on the fake gun one of the two guys had (police &military outfits are v population in our town for dressing up, esp for guys). In the middle of what I thought was a pleasant, civil convo he put the end of the gun near my face and said "Suck it!".
I'd watched very little porn at that time but I recognised the idea from reading the handmaiden's tale (in which the women are shown porn including women being forced to fellate real guns as an example of his bad it was before and how "good" they have it now). My reaction was obviously taken aback and negative and the guy looked embarrassed for a second. We talked some more civil shite (which I regret, blame socialisation into being pleasant and not confronting people I really wish I'd torn him a new one) and I went back to my group.
But it really struck me what he must be watching, how he'd project that into some girl in a bar and I thought me being friendly and jokey made him somehow think he could ask/get me to do it, which obviously would've been demeaning and quite sinister.