The first identified case was in a man aged 40 years (index patient) who tested HIV-negative on February 12, 2004, and on March 17, 2004, through regular monthly testing of blood samples, but subsequently tested HIV-positive on April 9, 2004. [...] During the time between his two negative tests, the index patient performed in film productions in Brazil, engaging in unprotected sexual acts. While in Brazil, he experienced an influenza-like illness that resolved before his return to California on or around March 10, 2004. According to LACDHS investigators, upon the return of the index patient to California, he participated in film productions in which he engaged in unprotected sexual acts with 13 female partners. Three of these 13 female partners subsequently tested HIV-positive by PCR after having tested HIV-negative during the preceding 30 days. [...] During film production, all three of the infected female partners had engaged with the index patient in specific acts associated with increased possibility of mucosal tears. None of the other adult film industry workers or private partners with whom these three women had contact during the 30 days before their diagnoses subsequently tested HIV-positive. As of May 20, 2004, the index patient reported having had no sex partners outside of work since February 12, 2004. The person who was the source of HIV infection for the index patient is unknown. [...] Production companies in the heterosexual segment of this industry have generally not required condom use for any type of sexual act.
(Emphasis added.) So, here's the drill. If you want to be a porn star 1) don't let any of your coworkers go to Brazil and 2) Do GAY porn only.