Even if you do think that we should have some level of "natural eugenics", it is very hard to make the case that the preferences of females are leading to a net improvement to the genetic quality of the human species. It is well known that women are sexually attracted to negative male traits such aggressiveness and violence (jailed criminals often get many female suitors after being arrested) and repulsed by objectively positive male traits such as high intelligence. Just look at the charts for the worldwide average human IQ levels and how they have been steadily dropping since the sexual revolution in the mid 20th century.