The things you can buy on the internet today...

Ready, steady, grow: athletes turn to Viagra - Times Online

Athletes may be using Viagra as an on field performance enhancing drug:

Experts believe that Viagra, which dilates blood vessels, could help in events requiring explosive power, such as sprinting. Others suggest it could help endurance – not so much marathon sex sessions as marathon running – particularly at high altitude or in polluted conditions, such as those expected at the Beijing Olympics. The drug is believed to aid the delivery of oxygen and nutrients to muscles.

How close in time to the race do they have to take it? And has there yet been a case where a guy who has taken it has had problems with the unintended side effect? It's not actually banned right now, by the way.

The article also notes:

Meanwhile, British officials are taking action to prevent athletes fooling dope testers by using false penises when giving urine samples. The penises, and untainted urine, are widely available on the internet.

Ah, the old false penis full of clean urine in the underpants trick. How to fight this:

Doping control officers have been given strict guidelines that athletes must be observed and their bodies visible from the stomach to the knees when they produce urine specimens.

I assume that paruresis can be a career threatening condition for athletes.

For those curious about the "readily available" fake urine test penis kits, you might be amused by the comments about the new and improved "Whizzinator" here, but the photo of the product makes it NOT SUITABLE FOR WORK. Here's a section:

By implementing a hidden internal check-valve, the act of urination is so realistic that even a direct observer will not be able to detect that it is in-fact simulated. There is no fumbling around with obvious switches or clamps. This eliminates a big problem associated with the original Whizzinator which has an on/off switch that is very audible and very obvious!