A woman goes to her doctor for a physical. All is going well, and she asks her doctor why it is she has been having trouble getting laid for the last several months. The doc says that he can offer no advice, for he is not a professional in the area of sex. He refers her to his friend Dr. Chang, a sex therapist from China. At Dr. Chang's office, the lady is asked to remove her clothing. With a little hesitation, she strips. Next the therapist asks her to get on her hands and knees and crawl as fast as she can across to the opposite side of the room. She protests, but follows his request upon explanation that it is necessary. Now Dr. Chang says,"now crawl as fast as you can back to me." The lady complies. Dr. Chang says, "ah, I know what your problem is...you have Zachary's Disease." The lady says, "what in the hell is Zachary's Disease?" Dr. Chang says, "your face looks exzachary like your ass! That's you why you can't get laid.