That's getting cause and effect kind of backwards. Swinging will inevitably become more socially acceptable (that's just how things work), and the changes in attitudes that make it acceptable will also make the idea of government-recognized polygamy more acceptable.
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Kilkrazy wrote:Perhaps a polyamorous marriage could be structured something like a limited liability company. The minimum number of people required is two, but more "directors" can be added and given shares in the company. The "profits" of the company are any legal privileges that the state establishes, plus the employment benefits offered by private companies, and would be pooled for distribution among the partners according to their share allotments.
That kind of works for the most basic case of {n >= 2} people all forming a single group marriage, but doesn't really cover a case where A marries B and C, and then C marries D but A and D don't have any kind of relationship. I guess you could in theory argue that the financial issues should all be handled jointly just to simplify things for the IRS, but you get into problems with things like child custody and medical decisions. For example, if A is in the hospital and unable to make their own decisions you want that responsibility to automatically go to B and C but not to D (unless no "higher priority" decision-maker is available).
So it might be a possible starting point, but
IMO it's probably going to take a pretty major re-write of the marriage laws to make it work for more than two people.