I have come to believe, through reading this thread... That the confusion is not actually what the word pussy refers too, I believe the confusion is simply that Cyborg Ninja doesn't understand that it is a slang and not a medical term? Honestly... Who teaches the word pussy in any form of sex ed classes? I mean, I have read through here, and there is some off-topic discussion about it being a vulgar word, but that wasn't what the thread was about.
What my interpretation of Cyborg Ninjas point is that Vagina and Vulva (not slang), are not to be referred to by the slang word pussy.
Slang Defined:
http://www.urbandictionary.com/define.php?term=pussy