Interesting discussion, guys.
Assume that 3 people are in the original position and they are considering how to create a just institution of marriage. None of them know which, if any, are male or female. — JohnRB
So the idea is that the veil of ignorance obliges one to take an approximately neutral position that favours equality in so far as it is compatible with prosperity, stability. and so on. Now in principle, one is ignorant of one's own position, but cognisant of the consequences of whatever options are being considered. And this is problematic in the case of marriage, or I should more properly say in more neutral terms the fundamental organisation of sexual relations, living arrangements and child-rearing.
What one has to call 'experiments' with other ways of living are so few, so diverse, and so pre-soaked in the conventions of family, that I do not think one can make a judgement.
It is a fairly general problem with the theory, that it tends, even with the good-will to all engendered by the veil, to stay with the known arrangements - 'for fear of something worse'. Not many of us have been brought up with free love in a commune, and one tends to have experienced a (monogamous) family for better, or institutional care for worse. So from the limited knowledge one has, I suspect most people (here) would favour something close to voluntary consenting relationships of any number with means of ending them available, and robust protection for minors. Roughly what we decadent Westerners have.
Anyways, just because Rawls invented the original position as a thought experiment, does not prevent us from conducting the experiment on our own knowledge and experience and reaching different conclusions. Those used to tribal living, or from a Kibbutz, might have other ideas...
Taken together as one scheme, — Rawls, A Theory of Justice (rev. ed.), p. 6
Incidentally, I understand this phrase to acknowledge
in principle, that there are other possible schemes, that one might choose if one knew of them.
An interesting critique of Western Society from an external view, can be found here and may be instructive.
https://www.channel4.com/programmes/meet-the-natives