Our brains carry a lot of baggage from the past. Testosterone and Aggression Let's look at the example of aggression.
Most people accept that men, on average, are more physically aggressive than women.
Boys engage in far more roughhouse play than girls, including the roughest contact sports such as football. Men also commit 90 percent of all violent crimes. Delving into the origins of human nature helps us to obtain an accurate understanding of who we are as a species. In adulthood, men have up to ten times the amount of circulating testosterone typically found in women. There are many studies linking testosterone to aggression in other species, and even some studies that have found the same relationship in humans.