Sorry itch removed all the standard payment options leaving us to bring our own which is just stripe and credit card. You can make a purchase on GOG if you need more options. Steam is also coming in the next couple of months.
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I understand that it is not your fault, it just sucks that it as it is. Is it really Itch that has problems with adult content or might it be directly paypal?
Out of curiosity, how difficult is it to add a new payment method? (Apparently in Stripe there are also options to activate things like "Giropay" or "Sofort").
Also thank you for the quick answer :)