Those three words are different agreements. Picking one is a conversation, not a ticket type.
What the research is about
Sex and Psychology has used this question for a course. The course is theirs. This page only separates the words.
Source: Monogamous, Monogamish, or Polyamorous? Join Me For a Course on Figuring Out Which Type of Relationship is Right For You, Sex and Psychology, September 28,
- Figures, samples, and methods are on that page.
How this shows up in public play
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Monogamous means closed, unless you have said otherwise.
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Monogamish usually means mostly closed, with narrow exceptions you still have to name.
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Polyamorous means more than one relationship is allowed, under whatever rules you actually set.
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Do not buy an event ticket as a substitute for choosing.