I figured some of you might find this interesting.

In a double blind study, testosterone administration was not found to have any effect of anger, mood, or hostility.

The dosage administered was the same dosage that bodybuilders commonly use.

https://academic.oup.com/jcem/article/81/10/3754/2650112

On anger:

No significant differences were observed in any of the subdomains of the MA1 scores at the baseline (before administration of the drug), between the subjects who received testosterone and the subjects who received the placebo. Analysis of variance with repeated measures revealed no significant differences in the interaction between treatment and time for any of the five subdomains of anger-in (P > 0.905), anger-out (P > 0.071), hostile outlook (P > 0.553), anger arousal (P > 0.612), and the range of anger eliciting situations (P > 0.343).

On mood.

There were no significant group differences between the testosterone or placebo treated subjects on any of the items related to general mood either before or at the end of the 10-week treatment period (Table 2). There was also no significant time-by-treatment interaction. Similarly, there were no significant differences in group scores related to emotional stability or angry behavior between the subjects receiving testosterone and the subjects receiving the placebo either before or after the treatment period; there were also no significant time-by-treatment interactions (Table 2).

From: https://www.reddit.com/r/MensRights/comments/eihyde/a_doubleblind_placebocontrolled_study_showed/

In fact, I disagree with the entire assumption that men are naturally more aggressive than women. It has been postulated that the types of aggressive behaviors that women engage in are more socially acceptable, and therefore less obvious. So it's not that women are less aggressive than men. People simply tolerate aggressive behaviors from women more than they do from men.

For example, studies on domestic violence have consistently found that women engage in aggressive behaviors more frequently than men do. The rates at which men and women are injured may be debatable, but women actually hit, scratch, kick, yell, and throw things more frequently than men do. This becomes even more obvious when you look at psychological aggression, and not just physical aggression.

One of many sources on this:

https://web.csulb.edu/~mfiebert/assault.htm

It's also been claimed that testosterone mainly rises in response to things like aggression and stress, and is therefore not the cause of aggression. This is similar to the role that cortisol has in the body. And testosterone appears to interact with cirtisol (things like chronic stress reduce testosterone levels over time). Like cortisol, testosterone doesn't cause aggression, but it will go up when a person is put into a situation where they may become the target of aggression or violence. This is true in both men and women.

I think the fact that people continue to postulate about the link between testosterone and aggression can itself be a form of sexism against men. Their logic must be that men are naturally more violent and that testosterone must therefore somehow be responsible for that. It plays into their "men are just defective women" narrative.