AT Duke University last fall, members of the Sigma Nu fraternity e-mailed 300 of their female classmates about an off-campus Halloween party. “Hey Ladies,” the invitation leered, complete with a misspelling, “Whether your dressing up as a slutty nurse, a slutty doctor, a slutty schoolgirl or just a total slut, we invite you...” Yes, there was outrage: in the form of fliers plastered around the Duke campus reprinting the offending e-mail and asking, “Is this why you came to Duke?” And there was official indignation: The recently formed Greek Women’s Initiative will be tackling the subject of gender relations. But...