Barebacking is the suspected culprit.Įverywhere on the gay hook-up radar, positive men are asking, telling, and serosorting. A recent study found that 75 percent of new hepatitis C virus (HCV) infections in HIV-positive men occurred in those with no history of injection drug use - the more typical transmission route for HCV. On an important side note: Is avoiding HIV enough? Research indicates that poz-on-poz sex is much more likely to include barebacking (unprotected sex), and that means the potential of pitting a sometimes compromised immune system against other sexually transmitted diseases.