http://en.wikipedia.org/wiki/Candir%C3%BA
"It is feared by the natives because it is attracted to urine or blood[citation needed], and if the bather is nude it will swim into an orifice (the anus or vagina, or even the penis—and deep into the urethra). It then erects its spine and begins to feed on the blood and body tissue just as it would from the gills of a fish. The candirú is then almost impossible to remove except through surgery. As the fish locates its host by following the water flow from the gills to its source, urinating while bathing increases the chance of a candiru homing in on a human urethra"
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