Hmmm

Of course, it's usually easy to find an equal and opposite study, but this one certainly provides food for thought:

Men would rather marry their female assistants than equal-ranking women or their supervisors, according to social psychologists. The results are based on a study of men's ratings of imaginary women with different job titles, during which they judged them according to their appeal as a one-night stand, friend, or long-term partner.