Your question reminds me of an analogy that I heard about some time ago. Perhaps it gives a reason to the question. It was proposed by a professor and he meant to describe the situation in Singapore. But I think it's applicable in most places.
The professor compared the society as a mountain. Both men and women start climbing from the bottom of the mountain. Men look down the mountain for their better halves while women look up the hill in order to find a husband.
Meaning, if you're a man, the higher you climb, the more women you can choose from when you look down the mountain. if you're a woman, the higher you climb, the fewer men you can choose from when you look up the mountain.