Who says economists aren't hilarious? From Akerlof and Kranton 2000:
Gender identity, as indicated earlier, could be formalized as follows. There is a set of categories C, ‘‘man’’ and ‘‘woman,’’ where men have higher social status than women. ... P associates to each category basic physical and other characteristics that constitute the ideal man or woman as well as specifies behavior in different situations according to gender. E.g., the ideal woman is female, thin, and should always wear a dress; the ideal man is male, muscular, and should never wear a dress, except perhaps on Halloween.