Hong Kong hooker

A sailor has sex with a Hong Kong hooker and a week later he goes to a doctor because his penis has turned yellow, purple and green.
The doctor takes a look and says, "Well, it's pretty bad. We'll have to amputate."
"No way!", says the sailor. He runs out and thinks "Hmm... Chinese girl - Chinese doctor."
So, he goes to Chinatown and finds a Chinese herbalist. The herbalist takes a look.
The sailor says, "Hey doc, the previous doctor said he'd have to amputate."
Chinese herbalist said, "Oh no. No need amputate. Two - three days - fall off all by itself!"