Here is a very interesting interview of biologist and Pulitzer Prize finalist Richard Prum by Rob Reid on sexual selection and the evolution of beauty.
One of the fundamental reasons birds are so beautiful is that most of them do not have penises and this creates an opportunity for female freedom of choice.
Sexual selection is not a form of natural selection as most biologists currently believe.
Sexual selection and natural selection are distinct evolutionary forces, as originally envisioned by Charles Darwin.
It’s possible for sexual selection to work in the opposite direction of natural selection which can lead to the extinction of a species. Some interesting examples are given for birds.
I’m thinking about how human females tend to be indifferent to male IQ, but strongly prefer high status males that contribute the most to overshoot and CO2 via mansions, yachts, long distance vacations, and Veblan goods.
Human male preferences tend to be benign as it’s unlikely extinction will be caused by big boobs, which Prum points out, are not an honest signal of fertility.