Prince Albert†discovered the impotence of being earnest.

-Cannadine, David
  Of Queen Victoria's consort. The Pleasure of the Past.

In the western hemisphere, the adherence of the United States to the Monroe Doctrine may force the United States, however reluctantly, in flagrant cases of wrongdoing or impotence, to the exercise of an international police power.

-Roosevelt,Theodore
  Message to Congress, 6 Dec.

I want to make it clear that it wasn't impotence that led me in to a reclusive existence.

-Roth, Philip Milton
The Human Stain.