If you're a porn star and you learn that a bunch of other porn stars have a bad STD, what you want to know right away is if you've fucked any of those people. This August, a syphilis outbreak plunged the San Fernando Valley's multibillion dollar porn industry into chaos, and any information about the origins and extent of the scourge was maddeningly sparse. So when the porn gossip blogger Mike South confirmed the identity of the outbreak's "patient zero" as a porn star who'd covered up his positive syphilis test, the relief was palpable among performers who could now at least roughly gauge their own exposure.