When You Pull That Out

One day a man took his wife to the doctor and says, "All she likes to do is do it. Can you help her?"

The doctor replies, "Come back in an hour." The man leaves so the doctor can perform his treatment.

One hour later the man returns to discover the doctor having sex with his wife. The man says, "What are you doing?!?"

The doctor says, "Taking her temperture."

The man replies, "When you pull that thing out it better have some numbers on it!"