These are great.
My three year old is stuck on everything private. For instance, he won't let me help him in the bathroom 'cause "that's private." And I'm not allowed to see his bellybutton, because that's "private." Of course, that doesn't apply when we're in a public bathroom and he says "mommy, do you have to go peepee or poopee?" And it certainly doesn't apply when he wants me to sing about his penis.
And I'll never forget the first time my oldest noticed that people come in different colors. We were in a restaurant and he looked at our server and said loudly, "Mommy, what color is
she!"