Spouse, I agree with you that it is discriminatory.
I believe it is due to two things: in the world we treat our bodies as a "commodity", available for trade to the highest bidder, and since the so-called "alpha" male is likely to make more money in business, people who are seeking the highest bidder will seek him.
The other thing is that our society around the world becomes more fascist every day, and the "alpha" type is the fighter. It is all about violence and Darwinian survival.
Love and gentleness have been tossed out along with any notion of Eternity being more important than physical survival.