STEVE CHAPMAN: Collateral Damage from ‘Reproductive Rights:’ The practice of eliminating people because of their sex or significant defects isn’t the worst of it.

If the effort to limit the contraceptive mandate were truly a frontal assault on women, a majority of them would not be endorsing the offensive. But the ideology of groups like Planned Parenthood and the National Organization for Women (NOW) sometimes ignores inconvenient gender realities.

Those advocates have been distracted from a different and far less figurative war on women—which, as it happens, is helped rather than hindered by one of the “reproductive rights” they champion. Legal abortion may empower women, but it has also become a powerful method for the mass elimination of females.

Modern technology allows prospective parents to learn the sex of a fetus, and many of them use that knowledge to exercise a preference for sons. Absent such intervention, about 105 boys are born for every 100 girls. But as Mara Hvistendahl reports in her 2011 book “Unnatural Selection,” the number for boys per 100 girls has risen to 112 in India and 121 in China.

It was once assumed that the general preference for male offspring would subside as countries became richer and women became more educated. But in country after country, that has proved false.

Nor is the phenomenon limited to the eastern hemisphere.

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