Toddlers are supremely curious about the world around them and their place in it; Adrian has started to notice that there are in fact two genders*.
He explained it to me thusly:
Dada has penis.
Mama has sunglasses.
Your guess is as good as mine on that one, as I wear my sunglasses on my face like everybody else.
* Well, mostly two genders. We don't happen to hang out with Adrian in places where a third gender is readily presentable as a lifestyle option.