Viagra-popping men soon will meet their match in patch-wearing women. The latest tool in the battle to rev up listless libidos is a little oval skin patch aimed at boosting a woman's sex drive. Trial runs of the patch, called Intrinsa, have been so promising that the Food and Drug Administration put it on the fast track to approval yesterday. "It works," said a 58-year-old Manhattan housewife who participated in a recent study of the Procter & Gamble invention. The woman said that once she started using the patch, sex with her husband of 29 years went from once a...