[Publius6961]

I notice the one ommision that's irrefutable.
The uncertainty of no marriage can have a stabilizing effect on expectations and hence effort to maintain the relationship.

This is simply biology and human nature, and no number of laws can overcome it.
Unfortunately, this is a rational argument only where children are not in the picture.

[frogjerk]

The uncertainty of no marriage can have a stabilizing effect on expectations and hence effort to maintain the relationship.

Please explain this as I am trying to parse this sentence but I don't get your meaning.