I'll try to find it. I think it came out last year.
Overall, same-sex married couples in the US have a 27% higher median household income than heterosexual married couples. This difference is due to the higher earnings men make over women.
https://en.wikipedia.org/wiki/Gay_wage_gap#:~:text=Overall%2C%20same%2Dsex%20married%20couples,earnings%20men%20make%20over%20women.