Also in the paper, there was a story that affluent women produce more sons. This also has something to do with evolution. because strong healthy males, can produce more children, which is good for the speices. Less affluent women (malnourished), produce less males, because weak males are not good for the human race.
Do ugly men produce more sperm?. When a farmer is looking to buy a stud merino, he looks at the size of the testicles. Testicle size is very important
