Testosterone is my favourite hormone, a focus of my research. In the public mind it is the bodys most potent chemical, making the diference between a 90-pound weakling and a he-man, between a milquetoast and a lothario. Steroid analogues, stacked by muscle builders, are supposed to cause out-of-control roid rages. Some people - lieve an injection of testosterone propelled Floyd Landis from also-ran to his mirac- lous Stage 17 of the Tour de France. The hormone has become part of the language of popular cultureT . he New York Times carried the following passages in the previous 2 weeks: I always thought downtown had a high testosterone level, referring to the high ma- to-female ratio of residents in lower Manhattan (14 April 2007). It is the kind of gathering that, at its most primal, has testosterone fowing more freely than the on-the-house spirits, referring to a news conference prior to a boxing match (20 April 2007). [T]hese are testosterone-fueled domains, largely defnedby bulging muscles and e- ploding guns, in a review of an action movie (20 April 2007). [T]his flm is about [auto racing] surfaces, for young men with testosterone to burn, from a review of another action movie (14 April 2007).

Male Sexual Health.- Structure and Physiology of the Testis.- Physiology of Erection.- Physiology of Ejaculation.- Drugs Which Compromise Male Sexual Health.- Adverse Drug Effects.- Male Sexual Health and Drugs.- Drugs Which Compromise Testicular Function.- Drugs Which Compromise Erectile Function.- Drugs Which Compromise Ejaculation.- Database of Drugs.