A fetish can be common in surveys and still be absent from the event you are attending.
What the research is about
Sex and Psychology reviews how often pregnancy fetishes show up in research.
Source: How Common are Pregnancy Fetishes?, Sex and Psychology, April 5,
- Figures, samples, and methods are on that page.
How this shows up in public play
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Do not assume a pregnant person shares the fetish.
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Venue dress codes and play rules still apply.
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Ask before you comment on someone's body.
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Prevalence is not permission.