The length of your member doesn't really have a whole lot to do with your reproductive fitness, but the length of your taint does. It's time to put away the rulers and whip out the digital calipers!
The loss of a protein that coats sperm may explain a significant proportion of infertility in men worldwide, according to a study by an international team of researchers. The research could open up new ways to screen and treat couples for infertility.
One of the paradoxes of human biology is that the rich world has fewer children than the poor world. In most species, improved circumstances increase reproductive effort, yet as economic development gets going, country after country has experienced the demographic transition: fertility drops