"What Am I Doing?" joke

What Am I Doing?
The brash young gynecologist, fresh out of medical school, took one look at his voluptuous new patient and abandoned his professional ethics entirely. As he stroked the supple skin of her naked body, he asked, "Do you understand what I am doing?"
"Yes," the patient answered.
"You're checking for dermatological abrasions.
"Correct," the doctor lied.
Next, he fondled her breasts long and lovingly.
Again, he inquired, "Do you understand what I am doing?"
"You're feeling for cancerous lumps," she ventured.
"Very astute," the doctor complimented, getting more excited. He placed the woman's feet in stirrups, dropped his pants, and slipped his member inside her.
"And do you understand what I am doing now?"
"All too well," the patient shot back. "You're contracting herpes!"