[Study author Julie] Brines believes the quandary many couples find themselves in comes down to this: “The less gender differentiation, the less sexual desire.” In other words, in an attempt to be gender-neutral, we may have become gender-neutered. ...
A study put out last year by the National Bureau of Economic Research shows that if a wife earns more than her husband, the couple are 15 percent less likely to report that their marriage is very happy; 32 percent more likely to report marital troubles in the past year; and 46 percent more likely to have discussed separating in the past year. Similarly, Lynn Prince Cooke found that though sharing breadwinning and household duties decreases the likelihood of divorce, that’s true only up to a point. If a wife earns more than her husband, the risk of divorce increases. Interestingly, Cooke’s study shows that the predicted risk of divorce is lowest when the husband does 40 percent of the housework and the wife earns 40 percent of the income.
--Lori Gottlieb, NYT Magazine, on politically incorrect correlations