I think you may be misreading the study. Based on the abstract, my takeaway was that women are not less ambitious, but that single women feel social pressure to

I think you may be misreading the study. Based on the abstract, my takeaway was that women are not less ambitious, but that single women feel social pressure to appear to be less ambitious. Which does eventually play into what actions they take. But the fact that non-single women do _not_ follow the same pattern is strong evidence that the concealment of ambition is a social issue, not a biological difference.