&gt;too much testosterone in individuals may actually be a detriment to the society as a whole.<p>Are you sure about that?  What about the Bonobos?  I don&#x27;t know specifically about their testosterone levels, but they have a <i>lot</i> of sex and basically have constant orgies, and seem to have very good social cohesion (for small apes) without any internal violence at all. A high sex drive doesn&#x27;t necessarily mean a lot of jealousy and competition between the males.