Read recent news articles (NY Times, LA Times, etc.) citing studies regarding harmful effects and lack of benefit of testosterone in
most men. The easiest way is to plug the word "testosterone" into the Google News web site.
Update: Tide has totally shifted against pro-testosterone commercials

An ambulance-chaser lawyer commercial was just on TV, offering to represent you if you've suffered harm as a result of taking doctor prescribed testosterone. I swear, it's not my Ad.
Second Update: Another ad by another law firm offering to represent users of Androgel, etc.
(Sitting in front of TV doing invoices and watching Premier League games. Liverpool!)