When referring to the private parts to a child, do you still use " flower" ?

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We use a different language with very little children when we refer to the anatomical private parts of the body like we call the female anatomical organ as "flower" etc. and the male as "birdie" etc. At what age do you start changing your lingo to the standard? I mention this because even with freshmen College students, when the word "v*agina" is mentioned, they seem to cringe and be ashamed of it. (This is in an anatomy and physiology class, where you have to name the parts of the body). Personally, I don't find anything wrong in using the correct terms while they're still young, (but- of course-not the slang or street word for it but the correct scientific name for it.) What about you? What are your thoughts on this? I would appreciate it if you could share your experiences in this matter so we can all learn. Thank you.