Everything Really Is About Sex

Psychology Today has a great article called Ten Politically Incorrect Truths About Human Nature where they explain some fun ideas about why people do the things they do with sex and evolution themed responses. Some of the explanations cover things like why evolutionarily, it makes sense for men to prefer blondes, (hint, it has nothing to do with American culture) why having sons reduces the chance of divorce, and why most suicide bombers are Muslim.

My favorite is about why most criminals and geniuses are most productive while young.

7. What Bill Gates and Paul McCartney have in common with criminals

For nearly a quarter of a century, criminologists have known about the "age-crime curve." In every society at all historical times, the tendency to commit crimes and other risk-taking behavior rapidly increases in early adolescence, peaks in late adolescence and early adulthood, rapidly decreases throughout the 20s and 30s, and levels off in middle age.

This curve is not limited to crime. The same age profile characterizes every quantifiable human behavior that is public (i.e., perceived by many potential mates) and costly (i.e., not affordable by all sexual competitors). The relationship between age and productivity among male jazz musicians, male painters, male writers, and male scientists—which might be called the "age-genius curve"—is essentially the same as the age-crime curve. Their productivity—the expressions of their genius—quickly peaks in early adulthood, and then equally quickly declines throughout adulthood. The age-genius curve among their female counterparts is much less pronounced; it does not peak or vary as much as a function of age.