In this case, “prep” is an acronym for Pre-Exposure Prophylaxis. In other words, the idea is if you take this drug before you are exposed, it can prevent infection of HIV. I wonder how many gays assume that this means they can engage in high-risk sex without condoms or other means of protection and avoid contracting AIDS...
All of them. What they don’t tell people is the long term side effects of taking ‘Prep’, nor the short term effects like nausea.