How do you *know* it's not an urban myth? You said it yourself:
"Mom said my aunt knew someone"
As in "a friend of a friend of a friend of mine", which is the classic form of 'providence' for urban myths. It doesn't mean it's in any way true. Your Mum says she has heard it from your Aunt, who, if *she* wasn't just passing on a 'friend of a friend' story, as simply heard it from someone - an unnamed, unlocated someone - who could have been lying or pulling her leg, or whatever. The fact is that you don't know them, and your Mum doesn't know them. Chances are your Aunt doesn't either, but just *heard* of someone.
Besides, the "girl named Vagina" is an old, old myth. Here's some examples:
http://www.snopes.com/racial/language/names.htm
♦ Chrisell ♦
All we have to decide is what to do with the time that is given us. - J.R.R. Tolkien.