You don't see the tremendous amount of selection bias in your sample?
Very quickly: people who need viagra don't like to talk about it, unlike drunken frat boys. The online market is targeting men who can't get it from their doctor because they don't have ED. That doesn't mean the vast majority of viagra users aren't suffering from ED, it just means that online ads are targeting a niche market.
Very quickly: people who need viagra don't like to talk about it, unlike drunken frat boys. The online market is targeting men who can't get it from their doctor because they don't have ED. That doesn't mean the vast majority of viagra users aren't suffering from ED, it just means that online ads are targeting a niche market.