Well - maybe they are gay! Or maybe the Pfizer execs decided to target the gay viagra market. Or maybe its creators realised how unrealistic it would be to have men hollering the virtues of viagra in front of women. Even someone with half a brain knows that you NEVER mention this stuff to women. None of us takes this shit, not one of us! We can all do it better at fifty than we could at twenty because of vitamins, or good genes, or fucking magic, or somesuch.