The topic of marriage privatization comes up once in a while -- the idea that government should get out of the business of regulating marriages, rather marriage would become a private contract. This way, gay marriage and poly marriage and such would totally legal without question.

I oppose the idea myself, though I'm not firm or clear in my objections. My biggest gripe is that it's associated mainly with libertarians, and I absolutely don't trust anything that's ever touched a libertarian.

Arguments that oppose marriage privatization:

• https://en.wikipedia.org/wiki/Marriage_privatization#Arguments_opposing_the_privatization_of_marriage
• http://reason.com/archives/2015/07/21/privatizing-marriage-is-a-terrible-idea (the libertarian case against it, wow...)

Arguments that support marriage privatization:

• https://www.cato.org/publications/commentary/privatize-marriage
• https://slate.com/news-and-politics/2018/04/new-york-times-columnist-ross-douthat-on-pope-francis-trump-and-conservative-writers.html