A 2014 study of Harvard Business School alumni—a group of people primed for high ambitions and flexibility—showed that more than half of men from their thirties to their sixties expected that their careers would take priority over their spouses’ careers: three quarters of these men had their expectations fulfilled. In contrast, less than a quarter of their female peers expected their spouses’ careers to take precedence over theirs, but this nonetheless happened 40 percent of the time. Biology
