I propose a new national law.
A 30 day money back guarantee!
Actually, no money back.
We need to generate some revenue.
Newlyweds should be able to opt out of a marriage within 30 days. Or more realistically, 90 days. If within that 90 day period after the marriage either participating party may opt out of the marriage and all records pertaining to the marriage will be null and void. To put it simply, it would be as if it never happened, legally anyway.
Of course 30 or 90 days are just arbitrarily chosen. Perhaps that value should be even greater.