"Mongolian VD" joke

An American tourist goes on a trip to China. While there he's quite sexually
promiscuous and takes no precautions. A week after arriving back home in the
States, he awakes one morning to find his privates covered with bright green
and purple spots. Horrified, he immediately goes to see his doctor. The
doctor has never seen anything like it and orders tests. He tells the man to
return in two days for the results. The man returns a couple of days later
and the doctor says, "I've got bad news for you. You've contracted what's
known as Mongolian VD. It's very rare and almost unheard of in the States.
We know very little about it." The man looks a little relieved and says,
"Well, okay, give me a shot or something and fix me up, Doc." The doctor
answers, "I'm sorry, there's no known cure. We're going to have to amputate
your penis."
The man screams in horror, "Oh no! I want a second opinion!". The doctor
replies, "Well it's your choice. Go ahead if you want, but surgery is the
only acceptable solution." The next day the man seeks out a Chinese doctor,
figuring that he'll know more about the disease. The Chinese doctor examines
him. "Ah yes, Mongolian VD. Very rare disease. " The guys says to the
doctor, "Yeah, yeah, I already know that, but what can you do? My American
doctor wants to operate and amputate my penis!". The Chinese doctor shakes
his head and laughs. "Stupid American doctor! Always want to operate. Make
more money that way. No need to operate."
The guy is so relieved. "Oh, thank God!" he exclaims. "So there's no need to
amputate my penis after all?" "No," the Chinese doctor replies. "It fall off
by itself!"