Kay Hymowitz:  Why Women Make Less Than Men (h/t Instapundit):

One stubborn fact of the labor market argues against the idea. That is the gender-hours gap, close cousin of the gender-wage gap. Most people have heard that full-time working American women earn only 77 cents for every dollar earned by men. Yet these numbers don’t take into account the actual number of hours worked. And it turns out that women work fewer hours than men.

The Labor Department defines full-time as 35 hours a week or more, and the “or more” is far more likely to refer to male workers than to female ones. According to the department, almost 55% of workers logging more than 35 hours a week are men. In 2007, 25% of men working full-time jobs had workweeks of 41 or more hours, compared with 14% of female full-time workers. In other words, the famous gender-wage gap is to a considerable degree a gender-hours gap.

The main reason that women spend less time at work than men—and that women are unlikely to be the richer sex—is obvious: children. Today, childless 20-something women do earn more than their male peers. But most are likely to cut back their hours after they have kids, giving men the hours, and income, advantage.

And I thought it all was the fault of the Republicans in the House.