You so rarelyi post an n/t, Tom, that I'm looking for the boobytrap...

Still, it's almost a rhetorical question: I would consider polygamy in the same category as gay marriage, a variation on the theme of a legally-recognized interpersonal relationship, acknowledged for legal reasons, but neither encouraged nor discouraged by a neutral government.

In fact, the more people you add to the equation, the more clearly it becomes a matter of free association. The government cannot prohibit communes, either; and there's no sharp dividing line between polygamy and communality.

I'd expect you to agree with me on this, Tom. It's a very Libertarian position, and not only that, Heinlein looked favorably on this kind of thing too. How can you resist?