There are different interpretations on equality, and I would say that the inequality in dating markets are a result of the markets as opposed to "nature."

Marriage used to be a familial tool for economics and politics, but it has shifted to being for "love." Did "nature" change or is it culture? However, "love" is ambiguous but some of its reasons seem to have roots in the old ways, such as money, power, or prestige. A person can be good looking and charming, but they need to be capable of providing for their partner. It would be rational for women to select for the best fit, and the imbalance of salaries could influence the imbalance in the dating market.