QUOTE
New York Daily News reports Roger Clemens kept Viagara in his locker at Yankee Stadium, according to a source familiar with the clubhouse; the drug is legal and has not been banned by MLB, but allegedly can help build endurance
A Link to NY Daily News Article
Wouldn't it have been a little more obvious if these athletes took Viagara as a "performance enhancer"
And I think they are confused on what kind of "endurance" that is built.