If you want to lose the solace that fact has provided you, here's another possibly also false but no less comforting bit of trivia:
spoiler
Leeches after feeding would love nothing more than a dark, somewhat moist, somewhat warm, somewhat tight environment. Which a human has and is probably something you don't want a leech to get anywhere near, be glad there's no such thing as a Analwig. Oh and land leeches exist.
In Norwegian they are called Klypedyr. Literal translation is pinching-animal (although we call it an insect). I always though that was scary as a kid, but I see now my trauma is tiny compared to ear-infesting-wig-wearing thingy.
I still don’t like them, but I tolerate them