Society recognizes certain relationships because they have been found to be beneficial to society as a whole, and thus are encouraged.
Cecile, I understand what you're saying, but it seems you have one foot in the past, and another in the present, "today:" Otherwise, how do you reconcile that "society recognises" the benefit of marriage, whilst at the same time, "too many people don't understand the concept of commitment;" i.e., Isn't "society" = "many people?"
Society has a historical memory, via tradition, that individuals do not. And as it happens, studies have been done to rediscover those reasons that we have forgotten, and they show that, in fact, society does benefit from marriage, although perhaps not as much now that individuals have lost the concept of lifelong commitment. But that means we individuals need to relearn what marriage truly should be, not that we should abandon it completely.
I disagree. Marriage is something many people have forgotten how to do properly, much like good manners or the art of conversation. That doesn't make those things societally irrelevant or unimportant. That makes them skills we need to recover, because they are still useful. Those people who DO have those skills make much more progress in life than others do. And marriage is the same way. Those people who do understand what marriage is and how to do it right get much more out of life than those who don't.
Whatever your motivations for it are, you are each making certain commitments and promises to each other, ie verbal contracts. And every time that you discuss your marriage and marital issues with each other afterward, you are engaging in renegotiation of your contractual agreement.
Balderdash. Unless all marital discussions take place under deposition on your planet?
Spouces on my planet lie to each other all the time.
You need to understand that "contract" does not necessarily refer to a wordy piece of paper with notarized signatures on the end. Even the law recognizes the concept of "verbal contracts", because you can sue someone for breach of contract without that piece of paper.
And sure spouses lie to each other. And people renege on written contracts. And both of them are breaches of contract. If you breach your marital contract with your spouse via lies badly enough, will your spouse not, in essence, sue you for breach of contract by way of divorce court?
That takes us back to people learning how to do marriage right. Rule number one: never breach the contract.