I guess it would depend on the occupation. For example, I don't see much difference between nurses and doctors in terms of something that could be quantified as a gender-specific preference. It seems to me that the idea of "nurses are women, doctors are men" came about more from the idea that women were "too stupid" to be doctors and that it was a "man's job." Even today many doctors look down on nurses (as 'below' them; people whose opinions don't matter), and men that decide to become nurses also face a uphill battle of social acceptance.