Take no notice of some people OP.
Look, you are upset by this In the context of your relationship, so it doesn’t really matter about other people.
He might have stayed longer than 10 mins, he might not. I think you have to look at this in the context of your whole relationship. Do you really think he makes a habit of this kind of thing? I doubt it, tbh.
I think in this occasion, you can make your feelings clear, but then let it go. I think most men have found themselves in that kind of place at some point.
I think some people who like to be all “coolio” about porn and strip clubs don’t always have a wider understanding of what might go on and they’re a bit naive tbh.
For instance, I once had the misfortune to live near a particularly nasty “strip pub” in East London which became infamous for an incident when a group of men stubbed their fags out on the poor woman’s legs while chanting, “We can see your cellulite.” It’s not always, “just a laugh” in these places. We all know this (or we should). Nobody can say it’s all fine and nothing to worry about unless they know the specific circumstances because clubs vary a lot.,
Also, it’s nonsense to compare women watching the Dreamboys or whatever to men in strip clubs because the power dynamic is totally different on so many levels. It’s not the same thing at all.
Similarly, with porn... Yes most men watch it. Many women watch it too. But what are they actually watching? Women pretending to be lesbians and getting off on each other in a group? People just having sex? If this is what people see as porn, then they may well not be bothered about it. Or are they watching some of the really nasty stuff - simulated rape, incest, choking, humiliation, violence - what? Because there is a sliding scale, some of which wouldn’t bother me, but much of it certainly would.