There are more adult oriented payment processors but they usually charge much higher rates because that sector attracts way more "I totally didn't buy that hone

There are more adult oriented payment processors but they usually charge much higher rates because that sector attracts way more "I totally didn't buy that honey it must be fraud, I'm contesting it" that costs them more and they get charged more by the big upstream processors like Visa and Mastercard. Plus you're still liable for their rules the same way itch's current processor is if you want to process their card transactions.