This article was reviewed by Darragh O'Carroll, MD. Key Takeaways: There's a commonly held stereotype that men with high testosterone levels are aggressive beefcakes who are prone to "roid rage," ready to throw a tantrum if you look at them the wrong way.

Testosterone neither ensures dominance nor acts as a straightforward trigger for aggression. I was observing a 9-year-old male baboon in the Serengeti of East Africa one day in 1983.