Stripe won't touch adult content, I've tried (chargeback ratio is very high, I don't blame them). Very hard to find processors who will work with adult content of any sort.

The real problem is that person to person money transfers shouldn't be prohibited unless by law. Perhaps Pornhub, in the US at least, could use something like Zelle to mediate transfers between patrons and performers (using their bank account to make Zelle requests, and then distributing that out to performers with Zelle). At least until the Fed gets their ACH modernization act together and we get near real time payments.