A woman was very distraught at the fact that she had not had a date,  nor any sex in quite sometime.  She was afraid she might have something wrong with her, so she decided to employ the medical expertise of a sex therapist. Her MD recommended that she go see Dr. Chang, the well-known sex  therapist.

So, she went to see him. Upon entering the  examination room, Dr. Chang said, "OK, you take off all  your crose."

"Now, get down and clawl reery fass to the odder side of room."

So, she did... Dr. Chang then said, "OK now clawl reery fass to  me",  so she did.

Dr. Chang slowly shook his head and said, "Your probrem vewy bad, you  haf Zachary Disease, worse case I ever see, dat why you not haf sex or dates."

Confused, the woman asked, "What is Zachary Disease?"   Dr. Chang replied, "It when your face rook Zachary rike your ass."