AT LONG LAST, AN EXPLANATION OF SETH ROGEN’S SEX APPEAL: Who ever loved, that loved not at first sight? A lot of people, it turns out. As I discuss in my NYT column on changing perceptions of “mate value,” psychologists and anthropologists can finally explain how someone who looks like Seth Rogen can wind up with someone who looks like Katherine Heigl, and why Mr. Darcy eventually falls in love with Elizabeth Bennet. The process may not come as a surprise to readers of Jane Austen novels or to viewers of Adam Sandler’s schlub-gets-babe movies, but at least we now have the data to back up our fantasies.