Originally Posted by Darth333
I can understand it for religious people (and/or perception of a couples' situation in some cultures) but otherwise, how so? Why would the relationship between two people who love each other necessarily be different? (save some of the legal aspects that apply mainly in case of separation or specific circumstances...but a non married couple can still have a fair custom contract that fits their needs and situation...). Save for the two exceptions mentioned above (religion and culture) I cannot think of any reason why it cannot be the same.
I would say that the lack of an easy out is one. And the legal responsibilities would be the other. But, if you're going to take all the significance out of marriage and just address is as a legal contract, then I would say the binding legal requirements of said contract.
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