If you think Patreon is PITA, then check this out:
can be checked at https://itch.io/docs/creators/faq#is-adult-content-allowed
The following is a non-exhaustive list of prohibited themes present in card processing networks. We are unable to support the sale of any works containing these topics:
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Non-consensual content (real or implied)
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Underage or “barely legal” themes
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Incest or pseudo-incest content
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Bestiality or animal-related
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Rape, coercion, or force-related
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Sex trafficking implications
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Revenge porn / voyeur / hidden cam
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Fetish involving bodily waste or extreme harm (e.g., “scat,” “vomit”)