It still wouldn't be feminist porn, because that society wouldn't need feminism, so that concept would be redundant. I've no idea what it would be like, to be honest.
That's a good point, but I would all the same argue that all porn - whether in a patriarchal society or not - is wrong. This is the point: porn is not just bad for being patriarchal (though it is for that reason) but is is bad in all possible manifestations in all possible societies.
Feminist porn - or porn that isn't patriarchal - does arguably exist already due to the gradual subversion of the porn industry by open communication networks and user generated content. Of course a lot of the platforms this material ends up on is still run by big, male dominated business, but the fact remains that less and less porn is being produced in studios for exclusively male consumption.
Think of this scenario, one that excludes men completely from the production, distribution and consumption of pornography. Two lesbian women meet and exchange sexual pictures and videos of themselves with mobile phones. Now, that is pornography. It might only be pornography with an audience of one, but it's still porn. It's the generation of visual material for the purposes of sexual stimulation. We don't think of it like that because we're still in thrall to the old model of porn.
We have this idea of porn as being stuff made by slimy businessmen in LA, and of course much of it is; but increasingly people are making their own 'porn' and distributing it on open platforms.
I don't think feminist debate is properly engaging with the changing nature of pornography and the growing role of tech in people's sex lives.
As the internet is not going to go away, people are going to use it to express their sexualities, for better or ill. It's not just a case of closing down porn sites now because, as I say, porn is flying around on Facebook, Twitter, Snapchat, email, text etc etc - it's been totally decentralised. And you have to admit that some of this porn is being created by women - and not because they've been pressured into it by a shady porn industry but because they're exhibitionists and derive a thrill from it.
You've then got two options. You either accept the dominance of porn try and encourage less patriarchal expressions of it, or you clamp down with a China/Iran level censorship To be honest, I'm not entirely averse to the latter option if it means children aren't harmed and human sexuality isn't reduced down to just another form of technologically assisted instant gratification.