The immoral doctor

Tim had felt guilty all day long. No matter how hard he tried to forget it, he just could not. The shame was overwhelming.

But he would hear a voice tell him: "Don't worry, you aren't the first doctor to sleep with your patient, and you certainly won;t be the last. And you're single, so just let it go."

But invariably the other voice would bring him back to reality: "Tim, you're a veterinarian..."