I have always tried to refer to all the body parts with their proper names.
However, the girls have come up with their own names for things. I'm sorry but it's true. There is the "pee-pee butt" for girls and the "funny pee-pee butt" for boys. They've been saying this forever and they think it's hilarious. I assure you they came up with this all on their own.
I think it's kind of funny too. Shhhh