people who think that there are genetic differences between men and women have failed, biology 101.
Bottom line people marry people whom they enjoy spending time with, that they are good friends, companions, partners.
I imagine if you looked at actual marriages for most of history most marriages were with relative peers, in the sense the two "families" were in the same social, cultural sphere. You have to understand a woman "choosing" her partner is relatively recent. The women's family had a large say. As far as hypergamy marrying "up" was the only way a female could aspire to a higher social status as most women were effectively barred from work and their only sphere was the home. Who know where the women would be financially, etc if they could work? Maybe they were simply choosing someone they saw as a peer to them.
Now that women can and do work, I have been hearing both the hypergamy argument. AND the fact that women don't "need" men financially and can choose their own sexual partners and this is somehow a problem. Well which one is it? Are women naturally gold diggers? If so why would guys be upset that women can earn money and don't need to depend on a man for living? You would think they would welcome this but they don't. Bottom line what seems to be threatening is the fact of women having choice. Females choosing their own mates, or choosing a female mate, or choosing maybe no mate, than hypergamy.