Names of impotence drugs seem to be popping up everywhere these days. E-mail come-ons for Cialis crowd our inboxes. Lengthy ads for Levitra bombard our TV screens. And who can forget former Republican presidential candidate Bob Dole’s star turn as a Viagra pitchman? Or NASCAR driver Mark Martin’s Viagra-mobile? Americans may soon see these impotence drugs’ names in yet another place: On a list of drugs covered by Medicare. Medicare’s drug standards agency, U.S. Pharmacopeia, recently included “impotence agents” in its draft list of drugs to be paid for by Medicare starting in 2006. Here’s hoping they strike the libido-lifting...