Whether someone is "born with" a fetish is a research argument. It does not change how you ask for consent.
What the research is about
Sex and Psychology answers a reader on that question.
Source: Sex Question Friday: Are Some People Born With Fetishes?, Sex and Psychology, September 25,
- Figures, samples, and methods are on that page.
How this shows up in public play
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Born, learned, or both: you still ask.
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You do not have to settle the science to go to a munch.
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A fetish you did not choose is still one other people can refuse.
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Read the source if the origin question is keeping you up. Then go outside.