Because when we all lived in caves like Sir Tigger, more aggressive males were deemed to be better protectors of a woman and her brood against wild animals and other wild men.

Yes, although these days I tend to rely on my good looks, wit and charm to woo the ladies, I still keep the club handy just in case!

+1 , women are more of a handful nowadays and harder to tame 
No, women have always been a tough breed and have had to be to put up with "male domination tendencies". I am from a long line of very tough women from the East End of London. My Great Great Grandmother was nicknamed "Battling Annie" as she would take on anyone, male and female, on those rough streets of Victorian London. She is a legend in our family! Her daughter
was equally as strong, and this has come down the line to me, although I have never taken on anyone physically, but verbally, in debates and discussions I don't hold back as my mother never did.
From what I see of women today they are far weaker and conscious of vanity than those hard working class women of the past. In fact they are now all gob and no do, siting on their big fat backsides as my ancestors never could. You either worked and fought for your kids, or you starved!