I think it's hard to have a conversation about "political correctness" because the term is problematic and a political football. Often (and I'm not directing this at the OP, whose cheerful and mature open-mindedness should be a model of behavior for us all) it's used as a kneejerk defense by people who'd prefer to be immune to others' critical responses to things they say or do. Too often the charge of political correctness is leveled as a weapon to invalidate other people's legitimate concerns about how they are being treated or portrayed.
That said, I think the arena of personal sexual fantasy should generally be free of those concerns. People can and do fantasize about the patriarchy, or slavery, or pretend-rape, or bestiality, or whatever, and should be able to indulge in those fantasies with other consenting adults without worrying that they're somehow inappropriate.
THAT said, it probably gets a little complicated when those fantasies are then turned into erotic artwork for others to consume. People who share those predilections will find the artwork arousing, while others who aren't wired to process the work as arousing might only see a celebration of patriarchy or slavery or rape or bestiality and understandably find it uncomfortable; in some cases that discomfort may give rise to commentary, and then you find yourself in an analytical (and possibly heated) dialogue that has nothing to do with the original intentions of the erotica, and that isn't particularly fun for anyone.
So it's probably wise to proceed with the understanding that imaginative works, even erotic ones that don't ring one's bell, should be approached with open-minded empathy and sensible tolerance; but also with the understanding that certain subjects in erotica (and elsewhere) are inevitably going to trigger decidedly un-erotic responses from certain viewers. Reasonable expectations from people on all sides of the conversation would make for a pleasanter and more productive experience for everyone. (Though I realize reason is in rather short supply all across the political spectrum nowadays.)