It’s a sweaty Wednesday night at Paddles, Chelsea’s S&M dungeon of spanking chairs, steel ankle restraints and rough oak leg spreaders, and the obligatory clothing-check at the front of the house is thronged with horny men looking to release a little midweek ennui and get their freak on. And then there’s the guy with the hypodermic needles—Cure T-shirt, skinny black jeans, medical ID lanyard slung around his neck, and the eager look of the do-gooder in his eyes—asking each man in turn if he’d like a vaccination. “It’s definitely a buzzkill, I know,” says Dr. Demetre Daskalakis, 39, an assistant professor of medicine at the New York University School of Medicine who works out of... More >>>