The disadvantage runs to adulthood, too, as adult men kill each other more often, take more risks and have more health problems, on average, than women, all of which cause them to die younger. Men produce an ungodly amount of sperm , while women have a finite egg count. The small bias toward males that remains in the sex ratio of the total world population probably results from social factors hinted at earlier: abortion of female fetuses and gendercide in Southeast Asia and much of the Middle East, where, in general, there is a strong cultural preference for males. Many demographers have speculated that the gender imbalance at birth may be evolution's way of evening things out overall. Well, it is in the United States, all of Europe, Australia and many other developed countries in fact, these countries have slightly more adult women than men. This skewed ratio is partly due to sex-selective abortion and "gendercide," the killing of female infants, in countries such as China and India where males are more desired. Parents who are genetically disposed to produce males will thus tend to have more grandchildren, and so their male-producing genes will spread, and male births will become more common. Why isn't the ratio perfectly even? But even discounting those factors, the completely natural male-to-female sex ratio still hovers around , meaning that women are inherently more likely to give birth to boys.
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