A guy comes home from work feeling bad about the day's activities. He lays down on the couch and ponders his actions. Like most of us, his conscience has two voices; that of his good moral side and that of his mischievous side.
While staring at the ceiling, a voice in his head says "don't worry about it, a lot of doctors have sex with their patients." The man tosses and turns in reflection of his actions. Again the voice says "don't worry about it, a lot of doctors have sex with their patients."
Feeling somewhat relieved, the man begins to relax and feel better about himself at which time another voice in head says, "but you're a veterinarian."