jspl Background factors in mate selection

After reading the section in the textbook about mate selection and how our family background influences who we choose to marry, I thought about how this tends to be true. The text said that couples tend to be educationally homogamous in marriages. I think that one reason could be due to the fact that couples could meet during their college experience. Another reason could be linked to the ideas of male dominance. Males seem like the would resist the idea of marrying a women who was more educated than them, or "smarter." I also found the part about how black women marry less educated men to be interesting. I wonder if a black women with a PhD would rather marry down or someone with the same education but of a different race.
The book also mentions that women are less likely to marry a man with low income than men to low income women. To me, this seems realistic, because women have been ingrained with the idea that men should be able to support the family. Also when a family only has one income earner, we typically think of the man as the bread winner.