Considering that Pfizer is already responsibly including the message that Viagra does not stop HIV or other STDs in their bus shelter ads and on the package insert, which also stresses the need for safer sex, I suspect that the AIDS Healthcare Foundation is campaigning against the company in order to squeeze an educational grant out of them.
 
In light of the fact that a year-long effort by an NIH panel to determine if Viagra was driving up HIV rates found scant evidence to back up a claim by the San Francisco health department STD chief that it was fueling new infections, it may be time for AHF and the SF DPH director of STD control to end their jihad against the drug and Pfizer.

In fact, the NIH panel found that Viagra and similar drugs are doing much to help people with AIDS have fulfilling, and safe, sex lives, something AHF should keep in mind as it hopefully ends its unnecessary jihad on Pfizer, a jihad, by the way, that contributes significantly to demonizing and stigmatizing gay men living with AIDS.

Also check out what some other people have to say on this topic.