I'm not surprised to see the research is showing this to be true. It is mostly belief system cultural environments the way you grow up what you're taught that really defines how people act. I'm a feminine woman with a very aggressive personality so people tell me I act like a man

That's a very interesting point endocrine system definitely does matter. There are conditions such as polycystic ovarian syndrome that raise testosterone dhea-sulfate and so forth and medicine has long looked at this as a cause of aggression in women. My take fuck that ;-)

Some actions are not Choice some actions are Instinct and come from the limbic system as a fight flight or freezer spots which is not really an emotionally or intellectually controllable urge. Otherwise I mostly agree. The field of ethology is interesting the biology of behavior