First of all please allow me to make a correction on my #29 above--
since it is now past editability. In the second paragraph, line two, I missed the negative '
not' (even in the proof-reading). I guess that just goes to show how strong 'covering' in visual perception can go--my mind read it in both times. That line should read:
...is something that is strikingly not found among the great apes
While mounting attempts may be spotted here and there, to some degree, you just don't find siblings going into pair-bonds--and seemingly in a lesser strength, first cousins.
I would agree, Kinsao chan, that in the general age (say late 18th century to now) the ceremony is used as a tool for public recognition. In the same breath I would also argue that social structure has pushed that (a socializing, or social conditioning factor) to become what it has; thus the tendency for the vast majority to almost automatically take the concept for granted.
What is it with the state of being married, as laid out by secular (or religious belief-system) law, that naturally fuels a need to publicly publish a promise to do something which is by simple nature, not yet so natural at all; if not the prior social constructed concept that this state called marriage is to be a non-nullifyable matter?
And what might it be that would have historically, more understandably given rise to the notion (especially in the Western World) that a male and female (physcially speaking) once having taking up sexual interaction are automatically bound by a sort of contract, if you will, to remain together in sexual union with each other alone, until one of them dies? Most surely, the doctrine of the Christian belief-system, is the answer I'd offer.
Even though we can see that religious ceremony was a prior phenomenon--looking back towards the earliest of recognizable times--I am not convinced that
that, then, was due to any emotional need to publicize the event except in 'royal' or 'tribal pacts'-like situations.
However, it is still most evident that even the Homo sapien, like most animals (and especially the great apes--
in that they are our closet kin species--is not a permanent pair bonding species. I am only pointing this out due to how I have interpreted your second to third line embedded clause. If I have misread you there, I apologize. It appears as though you had been suggesting that permanent pair bonding was a natural element of the H. sapien.
In Japan (as probably elsewhere in the world too) it is slowing becoming fashionable to have what is called a '
jinzen' ceremony--which means a simple ceremony before a small group of members of both families, and a few friends. This style ceremony is totally non-religious belief-system based.
Again, however, to strengthen a point made in my #29, the 'institution of marriage' is in great need of an overhaul. The connecting emotions with religious belief-system doctrine which are beyond natural factors (such as altruism) should be fully disconnected from the jurisdiction of the state, so that (holding other things equal) those with natural homosexual orientations can marry.