Missed that you replied, but he is some directions in case you see this. The first is a meta study done on testosterone by Robert Sapolsky. An other (which is

Missed that you replied, but he is some directions in case you see this. The first is a meta study done on testosterone by Robert Sapolsky. An other (which is referenced in that one) is a theory called the challenge hypothesis as it applies to humans, which makes predictions that testosterone rise along social status (as it apply to sexual reproduction), and it boost protective behavior in the case that status is challenged. One famous experiment was a version of the game theory experiment called the ultimatum game. If the experiment is carefully constructed in a way where social status is maintained by cooperation, and status is lost by aggression that rewards personal gain, people injected with testosterone behave more cooperative and less aggressive. A noticeable finding was that if participants was told they got injected by testosterone, but it was in reality a placebo, the participant then acted more aggressively and less cooperative, displaying contrast between the effect and the cultural perception. Testosterone has a few other effects, among those is that they disrupt receptors for female hormones that promote maternal behavior and bonding. Dog-human interaction promotes excretion of that female hormone in both humans (men and women) and dogs, a finding that itself has made some news. In modern time, social status still play a huge role. High status for men is highly correlated with successful reproductive success, better health and longer life. The benefit of having testosterone rise after gains in social status is a biological balance act, boosting protective behavior at a time where the potential risk from a loss in social status is at their peak. It also illustrate why testosterone levels goes down after a partner has given birth, as at that time the cost of lower social status is significant less and the benefit of improved bonding capabilities is a reproductive advantage.