Whilst I think it is really important that kids are comfortable and open with the correct terminology of their anatomy (amongst other things) I have to agree the 'vagina' is not the prettiest word. I will endeavor to persist anyway with my little girl but if we get stuck, I really like the word used in the yoga texts (sanskrit I presume). They call the female genitals 'yoni' and always refer to the vagina with such reverence and respect - unlike so many of the 'dirty' ideas that seem to still appear in our culture.