newsweek.com — It's Hotter Away from Home. Yet another good reason to go on vacation: better sex. Andrea, a 27-year-old writer who lives in Philadelphia, recently went to Paris for a weeklong vacation with her 30-year-old boyfriend, a chef in the Philly area. The Eiffel Tower and the Louvre and the Tuileries all lived up to their advance billing, but one aspect o