I walked into this discussion tonight when the little girls had been sent upstairs for PJs. They were both nekkid from the waist down and checking things out, ahem, "down there."
Mom (very casually, as not to scar them for life)~Whatcha doin?
Amelia (very excitedly)~We're looking at the holes in our bottoms!
Mom (trying not to turn green)~OK, well, let's get our PJs on.
Greta (jumping up and down with joy)~I HAVE A HOLE IN MY BOTTOM!!!
As I am trying to convince Greta to put her PJs on she says,
Greta~Mommy, can I see the hole in your bottom?
Mom~Um, nope. That's private.
Greta~PUH-LEEZE!!! You can see mine!!