Presumably it's natural in many countries in the West, but it most certainly is not natural in China or India (and hence the huge difference in ratios), but rather as a result of government policy (one child policy) combined with socioeconomic and cultural factors. Boys are more desirable for a variety of reasons, and thus female fetuses are often aborted.
Originally Posted by CDL.TO
Of course, the sex ratio varies by species. Since humans were likely to have been monogamous naturally (for the most part) a fairly even sex ratio makes some sense. Where this is not the case, quite uneven sex ratios might be more advantageous from an evolutionary perspective.
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