Casual partners do BDSM and group sex too. Casual does not mean unspoken.
What the research is about
Sex and Psychology compares those experiences among friends with benefits and romantic partners.
Source: Experiences With BDSM And Group Sex Among Friends With Benefits And Romantic Partners, Sex and Psychology, December 20,
- Figures, samples, and methods are on that page.
How this shows up in public play
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A casual dynamic needs the same stop word as a serious one.
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Spell out whether you are playing in public.
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Group sex adds more people who can revoke consent.
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Do not skip the talk because you already know each other.