Scene: The Girl is playing with the v. awesome Anatomically Correct Schleich Pony. (Have you seen these? They rock. Target has them; I tried to find a link but no luck.)
The Girl: I don't know whether Pony is a boy or a girl.
PK (turning Pony over and offering Exhibit A): Pony's a boy, honey.
The Girl: But he hasn't decided yet! He hasn't decided whether he wants to be a boy or a girl!
PK: Well, he's got a penis, honey, but I don't see why he can't be whatever he feels like being.
The Girl: He's gonna be a girl.