Jack, of course the two of you could have just turned to each other and declared yourself married to each other.
The problem comes when you try to involve the rest of us. Suppose later that day you got hit by a car and were unconscious in the hospital. Who would get to make medical decisions for you while you were unconscious? According to our law your next of kin would do so. But how do the rest of us know who that is? That’s what the piece of paper is for, to let the rest of us know that this stranger is now your next of kin, has power of attorney for you, will inherit your estate, and so on.
If you want to go to a lawyer and draw up a living will, a power of attorney, a will, and so on, you can certainly do so, but we’ve got a short form method of doing so in this country. We make you sign the piece of paper in front of witnesses so that we know who to believe if you’re unconscious in the hospital and one woman says pull the plug and the other says to keep the machines going.
As for mswas, what’s the difference between “marriage” and mating? There are some animal species that cohabitat and cooperate to raise their offspring for extended periods of time. It turns out that humans are one of those species. Some of our closest primate relatives don’t live this way, but we humans do.
Marriage wasn’t invented 300 years ago. It wasn’t invented by priests. If it was invented by priests, then why does it exist among every hunter-gatherer society ever encountered on every continent and in every era? How could this happen, if marriage was just a cultural institution? Cultural institutions are things that vary between human cultures. If a behavior exists in every human society ever recorded, doesn’t it seem odd to declare that it’s just something some priest made up one day? If it were just a cultural institution, wouldn’t we find SOME human societies that didn’t have this human-created institution?
Sure, ancient people didn’t make a distinction between civil authority and religious authority. But marriage has existed before there were contracts and governments, before there were priests and temples. It’s probable that the common ancestor of humans and chimpanzees that lived 6 million years ago didn’t have a social structure that included something like marriage. Gorillas, chimps, humans and orangutans all have very different social structures, you’d have to go to gibbons to find close primate relatives that have a social structure reminiscent of marriage. But at some point our modern human social structure evolved, and since this social structure is universal among all human beings it is almost certain that this social structure is older than the most recent common ancestor of all human beings. It could easily go back millions of years to Homo habilis or earlier.
While we might think it reasonable that the common ancestor of humans and chimps had a mating system that more resembles modern chimps, it could be that modern humans are more similar to our common ancestor than modern chimps are.
Marriage is therefore at least 200,000 years old, the age of the first appearance of Homo sapiens sapiens. It could be even older than that. But it sure isn’t something dreamed up by some Sumerian priest-king.