Names of body parts

I was changing my two-year old's diapers one day and he was pointing out all his body parts to me.

"Ear," he said, pointing to his ear.

"Good job, honey!" I said.

"Nose," he said.

"Good job!"

"Eye," he said.

"Good job!"

Then he pointed down to his little penis and frowned. "DON'T TOUCH!" he named it.

I didn't know what to say to that.