It's becoming harder and harder to find a performance enhancer drug that former Yankee pitcher Roger Clemens hasn't (sigh, allegedly) ingested, mainlined, or injected into his ass at one time or another over the course of his career: The Daily News reports today that Clemens, a one-time Hall of Fame lock who is now under investigation for maybe lying to the federal government about having taken steroids, also used to keep Viagra in a GNC bottle inside his locker.

Now, Clemens' well-documented extra-marital activities were probably reason enough to keep a stash of the little blue pills handy, but it seems that Viagra has become quite the fashionable (and legal, at least for the time being) drug for enhancing on-field performance as well. BALCO founder Victor Conte counts Jason Giambi, Barry Bonds, and disgraced sprinter Marion Jones among those who played on Team Viagra (off-label uses including helping athletes build endurance and facilitating in the delivery of oxygen and nutrients to muscles.) Use of the drug is so rampant that the World Anti-Doping Agency has launched a formal investigation into whether or not Viagra should be made illegal.

Of course, baseball has long accepted advertising dollars from Viagra-manufacturer Pfizer, and even has its own offical Viagra pitchman in former Texas Rangers slugger Rafael Palmiero (who was himself suspended by Major League Baseball after testing positive for anabolic steroids; he denies having ever taken them knowingly), so you can't really fault Clemens this time around. Unless, you know, you're his wife.