Consensual non-monogamy is common enough to study and uncommon enough that you still have to ask.
What the research is about
Sex and Psychology answers how common it is. Use their page when you need the rate.
Source: How Common Is Consensual Non-Monogamy?, Sex and Psychology, May 7,
- Figures, samples, and methods are on that page.
How this shows up in public play
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Common in a dataset is not common in every scene.
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Kink events and swing clubs overlap with non-monogamy. They are not the same crowd.
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Ask before you assume a couple is open.
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Pair the statistic with a real calendar if you want to meet people on purpose.