"I love you darling, will you spend the next 12 years with me to raise a child together?".
This is not purely cynical... I think its so cool when two people who have been married for 15 years decide to celebrate with second marriage ceremony to launch them into the next 15.
The time commitment should set the financial arrangements when you divorce - Ending a life long marriage might split 50/50 whereas ending a 10yr marriage might confer a 15% mix of wealth shared.
Some places do, down to a matter of hours. It's a slick way around prostitution laws and moral qualms.
I ask because my grandparents have been together for 50 years, my parents for 20, and I am pretty certain that both marriages will last to the death.
You just have another ;)
Getting married to raise a child is essentially a lifetime commitment, at least for one of the two getting married.
So why get married? Because you don't want the other person to be capable of throwing all of your sacrifices away on a whim just because you hit a rough patch.
Not sure this is really HN fodder but since we're on the subject.
That you give two almost completely diametrically opposed reasons for marriage says a lot about the schizophrenia of the institution. Marriage is simultaneously an expression of love and solidarity and a business contract with the potential for extremely stiff penalties in breach. It's the ultimate "trust but verify" of human relationships. The longer you ponder this the stranger the whole idea seems.
[1] Becoming much more likely these days!