I don't have access to the full paper, but I'm surprised to see that there's no definition of "ambitious." Is it ambitious to want to start a company or to want to raise children successfully? Perhaps women have a different definition of "ambitious", therefore men are trying to hold up women to their standard.
> "The questionnaire asks how often students are willing to travel for work, the number of hours per week they are willing to work, and their desired compensation. They were also asked to rate their ambition relative to their most recent work colleagues and their tendency to lead in day-to-day interactions on a 1-to-5 scale."