Hay estudios que dicen que cuando hay un desequilibrio en la sociedad y hay mas hombres que mujeres, la sociedad se vuelve mucho mas agresiva con tendencia a revueltas:
"China’s gender ratio -- 107 boys born for every 100 girls in 1980 — has widened to 118 boys born for every 100 girls as of 2010.
Sex-selective abortion is creating kindergartens of boys and villages of bachelors. In some areas, according to Dudley Poston, a sociologist at Texas A&M University, 160 boys are born for every 100 girls. (The natural gender balance at birth is 105 boys for every 100 girls.)
Professor Poston estimates that 40 million Chinese men may never find a wife. Less-educated, lower-income men struggle the most."