Julia Serano notes that masculine girls and women face much less social disapproval than feminine boys and men, which she attributes to sexism. Serano argues that women wanting to be like men is consistent with the idea that maleness is more valued in contemporary culture than femaleness, whereas men being willing to give up masculinity in favour of femininity directly threatens the notion of male superiority as well as the idea that men and women should be opposites. To support her thesis, Serano cites the far greater public scrutiny and disdain experienced by male-to-female cross-dressers compared with that faced by women who dress in masculine clothes, as well as research showing that parents are likelier to respond negatively to sons who like Barbie dolls and ballet or wear nail polish than they are to daughters exhibiting comparably masculine behaviours.