On Christmas morning, there might be one big present under the tree. Or there might be several presents of various sizes.
And that’s one way of explaining monogamy and polyamory.
(Or maybe monogamy is Christmas and polyamory is Chanukah, but that still needs a little thinking through.)
Votreplaisir 
Or maybe Hanukkah is a good way of explaining serial monogamy? 😀
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Ah, but each night‘s candles burn simultaneously. So the polycule gradually expands.
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