A contract between consenting adults to cohabitate, share their assets, and exclusively share the sexual parts with only each other is not up to society to legislate. To each his own. I see no way for me to legislate civil unions in country that is supposed to allow me to do all I want short of the end of your nose.
But this calling such a union marriage doesn’t make it marriage anymore the throwing a handful of balling bearings in the air and calling the result rain. Call it what you like. Do it if you like. Even God gives us that option. The result is the same in the end, hurt.
God and I will Love you either way…
From a discussion on another page: http://therecoveringlegalist.com/2014/03/25/my-definition-of-marriage-may-change/