When the so-called woman's liberation movement got underway in the sixties, it was widely assumed that women, given all the opportunities open to men, would want to and be able to assume any role that men had previously played. This in turn led to the near demise of men's college wrestling.
All social change leads to some losers among the presumed many winners.
It seems however, that the pendulum is swinging back. That's what little girls are made of. They didn't fight, they were helpful and friendly. Geneticists are now telling us that this is all normal. Testosterone drives males to bang heads, bump chests and try to spread their sperm far and wide.