I disagree, as you will provide everything needed from a financial point of view.
Humans work on incentives Ohh, why should I be loyal if I can have fun with the pool boy, and then if I leave, I︀ get 50%
Why many people say the person changes after they get married to them,︁ and the reason for that is that the incentive is no longer there; you have︂ a legally binding contract.
So there is an incentive to break the contract.
Take away︃ the incentive and the aditute suddenly is the same, and does not change, and is︄ always the best etc...
This is why, if you set up things properly 50% out︅ of 0 is still 0
As far as not getting married, this is an issue,︆ especially in a more traditional society, so the above solves almost all issues, as a︇ prenup can be thrown out, and in some places you have common law marriage etc...︈