A Tennessee doctor had just finished a marathon sex session with one of his patients. He was resting afterwards and was feeling a bit guilty because he thought it wasn't really ethical to screw one of his patients.
He called a friend of his, a Texas doctor for advice, and told him his story and asked for his Texas wisdom.
The Texas doctor replies, "Lots of other doctors have sex with their patients so its not like you're the first...".
This made the Tennessee doctor feel a little bit better
until the Texas doctor said, "... but they probably weren't veterinarians".