Research on the "ideal" threesome describes preferences. It does not staff your weekend.
What the research is about
Sex and Psychology breaks down what people say they want. Your only useful version is the one the other two people also want.
Source: What Does the Ideal Threesome Look Like?, Sex and Psychology, August 8,
- Figures, samples, and methods are on that page.
How this shows up in public play
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Preferences in a study are not a script.
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Gender mix is a negotiation, not a default.
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A play party is a poor place to spring a third on a partner.
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Talk about feelings after, not only during.