Marriage is first of a a religious act ..a vow of sexual nature..government it very late to the game..consider Henry the 8th..he was head of state and wanted a divorce yet he could not because the church controlled..so really do we want the state involved in what is a religious sexual vow?..no..the only aspect the state needs to be involved with in regardes to sex is the legal status of the persons created by a sexact..the not sexual aspect of what the state now bundel in to “marriage” is just legal contract and the state has no reason to tied that to sex or call it “marriage” ...
let Marrige be
1. A religious vow ith regared to sex
2. A Legal status for the product of sex..children
and thats it.
The other not sexual aspect should be a legal contract between any persons
People had married for thousands of years, all over the world, before Henry the Eighth.