I have not even mentioned the word wife until now.
It is their private contract that is not my business.
Still on some level even she does not own contractually own a body part of a soverign human being (husband or not) unless it is her own body.

To discuss this further is to be mired in a swamp of how far capitalism and slavery go.
For example it is illegal to own organs today but your own DNA is private property for those who patent it to buy and sell it on the open market. We are in an infancy of coherent privacy and self ownership laws. Sometimes I think our legacy of slavery has influenced the ethics of self ownership. It is certainly at the heart of women's health.