In economies in which women work, men and women in relationships make about the same amount of money, or women make more. Women are 40 percent of breadwinners in America, and that number's been rising.

The problem with the way we discuss gender is that it tends to be "Let's sympathize with women" or "Let's sympathize with men."

Marriage is not one point of view: it's a constant back and forth over different perspectives - a healthy marriage, anyway.

The research points pretty clearly to the rise of companionate marriage, and I just think it's going to keep being popular, for the very simple reason that it's basically the only way to afford a family life in the 21st-century in advanced economies. It's one of the major reasons for the spike in income inequality. Surgeons used to marry their secretaries. Now they marry other surgeons.

Almost all the voices in history have been men, but on this one question of gender, men don't talk about it. This has nothing to do with women; it has to do with men.

The division [between how much housework men and women do] is declining across all advanced economies - not for the reasons that people want, which is men are doing more, but because women are doing less of it, but even then, the trend is getting towards equality.

Women become breadwinners, men become caregivers. That's the birth of intimate marriage.