Polygamy...

Polygamy ... a kind of “polyamory”.  When I was a kid, lo these many decades ago, such things were to be found only in breathless tabloid articles and dry histories.  Once in a while you might see a reference to contemporaneous polyamory in exotic foreign lands.  Never would you run into it as a possibility in mainstream American society.

Things change.  Faster than I'd ever have thought.  What's the next frontier in permissiveness after polyamory?  I'm guessing it will be the mainstreaming of bestiality, but I stand ready to be surprised...