Biologically women are wired to look for different things in our mate than men. Reproduction is a much larger undertaking for women and highly risky in terms of maternal and infant health.
With no support or any help for physical protection and attaining food and shelter, a woman alone and pregnant or with an infant/young child in ancient (and not so ancient) times was in serious danger of death.
Therefore women (generally) want to take longer sizing up their potential mate to establish if he is going to stick around to help keep her and their child alive. The 3 Ps of Masculinity: Paternity, Protection and Provision.
Physical health and attractiveness in men is obviously important to women in terms of reproduction, but it's not enough. It's highly risky to just chose a mate on looks alone.
For men the reproductive risk is that no woman will choose them for reproduction, so their bar is a lot lower. As long as a woman is halfway decent and willing to bear his child that fulfills all the necessary requirements.
A form of marriage developed in all societies (before reliable contraception) so that not only would each party be required to stick around for their biological offspring, but so the rest of the tribe/society could prepare them for parenthood.
I am not suggesting that we are choosing our partners on such crude biological criteria these days, but that the biological tendencies of mate selection is still present with a lot of social layering.