I’ve tried that MANY times. I even asked why cant 20 people get married to 20 other people and have a 40 person marriage.
They then launch into some thing about “we are only talking about 2 people” TOTALLY DESTROYING THEIR POSITION THAT THEY WANT “MARRIAGE EQUALITY”!
There is no doubt they should also authorize a threesome..since it is a frequent combination. Plus..there is no problem with a father marrying a son to pass down the family fortune.