In penis re-attachment, there is often complications related to blood flow and skin necrosis. There are at least two mentions in medical literature where leeches were used to help these symptoms.

http://www.jpgmonline.com/viewimage.asp ... 297_b4.jpg

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The old ways can sometimes be good ways, but this gives me the creeps!

Certainly NOT what comes to mind when one mentions getting their dick sucked...