A man goes to the doctor...

A man goes to the doctor...

The doctor asks him what's wrong.

"Doc, my chest has been hurting, and I've had a terrible cough for three days. And I think I've been running a fever."

The doctor looks him up and down and quickly says, "Well I can tell you right now you're going to have to stop masturbating immediately."

Shocked, the man says "Why???"

"So I can examine you."