I propose a new state law (heck - while we're at it, let's make it a Federal law):
"No marriage shall be valid in this state, or in any state of the Union, that has not first been approved by the California/United States Ministry of Marriage and Family Life. This provision applies to all persons without regard to age, gender, citizenship or place of residence, and applies without regard to the date or place of marriage."
Would you approve? I doubt that anyone here would approve. Why not? Because (I think) most people are of the opinion that her or his marriage (whom to marry) is her or his own personal business. Yet, most places do have some restrictions on marriage relating to age (below age "n" requires parental consent); degree of consanguinity of the parties; absence of disease; maybe a few others.
What restrictions are tolerable and why?