Hate any words that describe genitalia other than what they are...
foof, willy, etc.
Find it so childish.
From about the years 4-5 taught my son that his 'willy' was called a penis. His 'balls' were actually called testiscles and his 'sack' was called a scrotum.
If I had a girl/daughter, no doubt, I would have taught her the proper terms for her reproductive organs.
Just find it all a bit juvinile otherwise.