NFL wide receiver Brandon Marshall says he's heard of some NFL players using the drug to improve athletic performance — on the field. One benefit of Viagara and similar drugs would be the enhanced delivery of oxygen to the muscles, which also aids in hastening the body's recovery from workouts. The drug also counteracts impotence, a frequent side-effect of steroid usage.
http://msn.foxsports.com/nfl/story/nfl-players-viagra-brandon-marshall-performance-enhancing-drug-112912
