The second theory is similar and is known as "evolutionary neuroandrogenic (ENA) theory of male aggression".   Testosterone and other androgens have evolved to masculinize a brain in order to be competitive even to the point of risking harm to the person and others. By doing so, individuals with masculinized brains as a result of pre-natal and adult life testosterone and androgens enhance their resource acquiring abilities in order to survive, attract and copulate with mates as much as possible.  The masculinization of the brain is not just mediated by testosterone levels at the adult stage, but also testosterone exposure in the womb as a fetus. Higher pre-natal testosterone indicated by a low digit ratio as well as adult testosterone levels increased risk of fouls or aggression among male players in a soccer game.  Studies have also found higher pre-natal testosterone or lower digit ratio to be correlated with higher aggression in males.     
So, I’m 17. I started training with weights in Dec 2013 with absolutely no knowlege/experiece. I got my squat from 80 to now 145lbs. I can deadlift 160lbs easily. Bench press on and off since my bench is broke. So would you say my beginner gains are gone and I need to use creatine? I am going to buy some whey soon. I am also trying to gain weight. I’m 147 right now. Trying to be 155 by mid-June. Any suggestions to add on to this. I did 5×5 training for almost 10 weeks a few months ago (got me to that heavy squat lol 😉 )
The Fitness column last Thursday, about nutritional supplements for exercisers, overstated Dr. Teri M. McCambridge’s role at the American Academy of Pediatrics. She is the chairwoman of its council on sports medicine and fitness, not the chairwoman of the entire academy. The article also referred incorrectly to nitric oxide; although caffeine is often added to supplements that contain it, it is not a caffeine-based stimulant. And a picture caption with the article misidentified the exerciser who begins his morning workout by taking .-Xplode. As the article correctly reported, he is Michael Deutsch not Alex Feintuch, who is shown in the picture.