[mvpel]

Another suggestion: marriage has existed as the union of one man, one woman for thousands of years.

The biblical patriarchs often had multiple wives - two daughters of Laban spring immediately to mind.

[NutCrackerBoy]

OK then only a thousand or two. It is pretty firmly established all around the world, don't you think? I have better arguments for why it should be kept than "it's the way we've being doing it for a long, long time." But even without those arguments, shouldn't there be enormous onus on the antis to explain why it is so very important to throw the definition out.?