The approximate process is that you use your address to add your wife's address to his contract, and then use your wife's address to add your address to the contract.（gas fee=$150*2）
So u got married in the blockchain.
Finally, an nft with the address of you and your wife is generated.
That’s quite funny, but I know that people can do anything just to make money, even the last thing that you would have expected. I have seen a news about couple that wedded on blockchain, so I’m not really surprised seeing a news like this as well. Since NFTs came out, there has been a lot of things being sold on these platforms and a lot of people have taken advantage of it to do as it pleases them. If you can play with their marriage like this, then I guess they might as well break up and sell it on blockchain, Just like Dave said.