Every congresswoman surely endures the same strains that drive some of her male colleagues to have affairs: lots of travel, families far away, heady work that makes a domestic routine seem distant and boring. But the stakes are much higher for women, because they are still judged by a different standard.

People with a college education are now less likely to divorce than they were a few decades ago, and they're more likely to describe their marriages as happy. That finding really surprised me. It appears that those with a higher education have been more able to dismantle strict traditional roles and, in doing so, gain more freedom. I call it a seesaw marriage, one in which both the man and the woman take turns being the breadwinner, making it possible for each of them to experience career advancements or breaks at different times.

Although they are unfailingly gracious, evangelicals are not so good at respecting professional boundaries.

As we get used to women in power, we are likely to discover that they behave much like powerful men - vain, entitled, always looking for more.

In the US in recent years, around a third of all open management positions have gone to women. My research over the last three years has shown that the trend is going in the same direction at all levels. And by the way, it's not necessarily that the rise of women is causing the end of men - it's more the other way around. An increasing number of men are failing during their education, losing their jobs and then not managing to get back on their feet, so women have had to step in. The driving force here isn't feminist conviction, it's economic necessity.

We are still proprietary over the domestic realm even as we take over new professional realms, and that is a real problem.

I deeply believe that men and women need each other.