We use doodle and gina. DD knows that she is a girl because she has a gina and Daddy is a boy because he has a doodle.

We did try to use penis but we had a HUGE problem in that DD is allergic to peanuts and has been taught to say "I can't eat peanuts, they make me very sick". So when Daddy said to her that he had a penis..... DD said "I can't eat penis, they make me very sick" so after we picked ourselves up off the floor from our hysterics and advised her that she should keep saying that until she is 21 we decided to keep it as doodle