Unusual fetishes are a long list. A public space cannot host all of them, and does not try.
What the research is about
Sex and Psychology looks past foot fetishes at less common ones.
Source: Beyond The Foot: A Look At Some Of The Most Unusual Sexual Fetishes, Sex and Psychology, November 4,
- Figures, samples, and methods are on that page.
How this shows up in public play
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If your fetish needs a specific setup, ask the host before you arrive.
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Banned acts stay banned no matter how niche the interest is.
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Private negotiation beats a public surprise.
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Rarity is not the same as risk. Some rare acts are harmless. Some common ones are not.