https://osf.io/preprints/socarxiv/6aqse/

Write up on the study: https://www.theatlantic.com/family/archive/2018/04/young-couples-separate-bank-accounts/558473/?utm_source=atlfb

Key points:

Pepin asked respondents to select an “income allocation strategy” for a variety of hypothetical couples. When the woman was the primary breadwinner, respondents suggested that she withhold more income than the man in situations when he was the higher-earning partner.

Bear in mind that this means people consciously decided this as the question was asked both ways, and they deliberately chose a double standard that benefits women and disadvantages men.

Thrway_1000 made an interesting point in the comments: https://www.reddit.com/r/MensRights/comments/8eakbb/when_women_are_the_primary_breadwinner_theyre/dxtsj3g/