BALTIMOREAll-Star first baseman and sexual-dysfunction-drug pitchman Rafael Palmeiro was suspended for using performance-enhancing substances just weeks after entering the 3,000-hit club and months after appearing on Viagra commercials. 'Tests of Palmeiro's blood samples taken during this season have revealed the presence of the muscle-growth-enhancing substance stanozolol,' said Commissioner Bud Selig in a statement that many say casts a shadow over Palmeiro's history of solid play and endorsement of the erection-growth-enhancing drug sildenafil citrate. Spokesmen for Palmeiro, who could not be reached for comment, say that he wishes to put the performance-enhancing-drug controversy behind him as soon as possible so that he can return to what he does best, namely baseball and lucrative performance-enhancing-drug endorsement. 