A new frontier in civil unions ?
Well, shoot - that's not much of a flashback ....
Let's try a little further back .... like 1830

http://mormon-polygamy.org/mormon_history
... or the ongoing polyglut in islam ... that's a tad further back ....
Or we could go to the book of Kings - Who were those two fine examples of monogamy back then .... Saul and David come to mind ....
LOL - just playin' with ya, Due - Don't have any flashback music to accompany that history, howsomever - I kinda pass on the mtc (mormontabernaclechoir) stuff and not too many hymns address the issue (surprise, surprise).
Oh well ... nothing new under the sun after all, eh ?
PS: Why any man in his right mind would have more than one wife at a time, or civil union, is way beyond this aggie's understanding. Hell - one of 'em is enuf ta drive a sane man nuts.