Referred to as Patient A, the man had apparently contracted HIV from a non-work partner, the report found, but HIV tests do not necessarily detect recent infections. Over the following weeks, the man had bareback sex with 17 other men - 12 performers and five non-work partners. The incident involved a 25-year-old man who had tested negative for the virus in 2014, the CDC said in the report released Friday. The agency advised performers to wear condoms and consider taking a drug that can prevent transmission. A new Center for Disease Control report found that a porn actor likely infected another performer with HIV while having condom-less sex on a gay porn set - leading the agency to warn that testing alone is insufficient to prevent the virus's spread in the adult entertainment industry.