To start with, the most obvious difference between sexes is the anatomy. Even male and female animals look quite different. It is, however, interesting to note that, while animals have so similar faces that it is hard to identify them individually; our individual faces are so different. We have so much difficulty in finding, even a lookalike.
But then, the facial contour of man and woman is so different that even babies can identify a male and a female face. However, differences between sexes go much beyond anatomy.
