There's a new strategy in the fight against HIV, especially among men who have sex with men (MSM): a drug called Truvada, also referred to as PrEP (for pre-exposure prophylaxis). Early reports suggest that taking Truvada can nearly eliminate the risk of an HIV-negative individual acquiring HIV. PrEP has been somewhat controversial, since one might reasonably conjecture that reducing the risk of unprotected sex will increase the prevalence of unprotected sex.
