Men are many times more complex than women in terms of personality and behaviour. In other words, what we have is female conservatism on the one hand and male progressivism on the other; because of the great complexity of male socio-sexual behaviour, men vary much more in terms of human trait possession than women. The mere recognition of greater male variability in terms of both mental, emotional, and physical characteristics is something that has been known by Charles Darwin and discussed at great length by the celebrated English sexologist Havelock Ellis. Concerning the principle of greater male variability as manifested in terms of genius, Havelock Ellis wrote in the book "Man and Woman":
We must regard genius as an organic congenital abnormality ... and in nearly every department it is undeniably of more frequent occurrence among men than among women.... Genius is more common among men by virtue of the same general tendency by which idiocy is more common among men. The two facts are but two aspects of a larger zoological fact — the greater variability of the male.
The principle of male variance and monotonous female uniformity can be readily demonstrated on a mathematical level by constructing a Gaussian curve which plots the incidence of sexual dimorphism in male-female personality and behaviour. It will be seen from the standard normal distribution along the curve itself that not only do men have higher standard deviations than women but that men always have a tendency to cluster around the upper and lower extremes of the curve, whereas women, being generally homogeneous in both personality and behaviour, tend to have lower standard deviations and tend to gravitate towards the middle of the curve. Thus, there are more men of genius and high intelligence than women; more male daredevils than women; more male eccentrics than women; more males with tremendous athletic ability than women; more men with high levels of creativity than women; more men with a much greater sense of humour than women; more male criminals than women etc. This is so because of three major reasons. Firstly, because alleles on both sex chromosomes present within the male genome are not coupled in the same dominant or recessive pairs as in the female; this means that there is nothing to mask the expression of gene replication errors in RNA transcription within the male lineage itself, ultimately producing a wide variation in both male temperament and phenotype. Secondly, men often bear the brunt of male-male competition for available females, and because of this are forced to become a kind of genetic filter for the species.
Lastly, greater male variability is due to the presence of testosterone which enhances neuro-biological mechanisms for individual motivation within the male central nervous system, thus giving men a much greater drive to adapt and overcome whatever obstacles have been placed in their way by an unforgiving and merciless environment. All of these features are lacking in the human female, making women roughly homogeneous in both personality and behaviour across all times and places, all ethnicities and cultures.