The Naughty Doctor!

Howard had felt guilty all day long. No matter how much he tried to
forget about it, he couldn't. The guilt and sense of shame was
overwhelming. But every once in a while he'd hear that soothing voice
trying to reassure him:

"Howard, don't worry about it. You're not the first doctor to sleep
with one of your patients and you 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:

"Howard, you're a veterinarian...."