Vagina: One of the truly great words. Not only do more than 50% of the people on the planet have one, there is no possible misunderstanding regarding what you are talking about. However, although it is descriptive, it can be very clinical sounding and difficult to make it “sound” sexy. I have tried to use it sparingly to break up to frequent use of the word “pussy”.
There is no substitute for vagina in a clinical setting. That is the only word a doctor will use. “I’m afraid your vagina wasn’t meant to do that.” or “I have to insert this in your vagina in order to see what is really going on.”
The naive again, she doesn’t have any other words for it: “You mean in my… Vagina?”
I love it for expletives: “You want to put that inside my vagina? Are you out of your mind?”
Of course it can be sexy too: His lips lingered on her clit before moving on to the world’s most succulent vagina.