When my husband was in graduate school, I supported us both. It was stressful to me but easy for him. First year out of school, we made within 100 dollars of each other's income. He was proud he got just a little bit more. I reminded him of how close it was, and that the prior two years was much less. He said he appreciated me supporting him, then it was his turn to support "us".
His income started to rise faster than mine.
We both had engineering degrees, working full time the first few years of our marriage.
For men, it is a matter of pride to make more. For women, it is often a matter of lifestyle choices that decrease income, such as when I took time off after having kids and shifted to part time work.
Most men with a work ethic feel bad if their wife makes more. However, there are lay-abouts happy to have the woman work to support them both. And there are times, such as during medical crisis and bouts of unemployment, that the woman can make much more.
The norm for most human societies and income brackets is for him to make more. And in better alignment with human nature.