That term has largely been replaced by erectile dysfunction and reflects increasing acceptance about a condition that will affect most men in their lifetime — the inability to produce or maintain an erection for sexual intercourse.

Now widely regarded as a highly-treatable condition — thanks, in large part, to the advertising blitz of pharmaceutical companies — erectile dysfunction has been the subject of heavy research, resulting in substantial medical advances. And 2013 has been a landmark year for commemorating many of them: the 15th anniversary of the Food and Drug Administration's approval of Viagra —