A popular exercise among High School creative writing teachers in America is to ask students to imagine they have been transformed, for a day, into someone of the opposite sex, and describe what that day might be like. The results, apparently, are uncannily uniform. The girls all write long and detailed essays that clearly show they have spent a great deal of time thinking about the subject. Half of the boys usually refuse to write the essay entirely. Those who do make it clear they have not the slightest conception what being a teenage girl might be like, and deeply resent having to think about it.