The difference between boys and girls

So, Hugh pipes up from the back seat on the way home from tennis: "Do girls have sweat too?"

In the past little while, he is only just coming to terms with the fact that mums do poos on the toilet as well. (I wish i didn't have to be the one to teach him this.) He was adamant that I was the only girl in the world who "claimed" to do poos on the toilet, but I was actually pretending, because girls don't poo. Then we got Lily, and a small revelation occured to him: "Mum, Lily did a poo! But she's a girl? .....you're a girl, and you do poos, and Lily's a girl, and she does poos!" I have no idea where in the world he got the idea that girls don't poo .......

He is increasingly interested in the difference between boys and girls, not the most obvious, generally hidden difference - but the way the girls play differently at school. He's been making note of who wears make-up and the difference in clothes marketed at girls vs those marketed toward boys. He must have had some sort of hesitation about what girls are all about because since he has spent quality time with his cousin Evie, he often makes comments such as, "Mum, I actually love girls," in ways which make me think he had really ummed and ahhed about this decision.

So back to the conversation; Yeah Hugh, girls do have sweat like boys.
But girls are different!
Well, not really. Girls are people too.
But they have a different place where the wee comes....
Yeah, but we eat food like boys, and we can see, smell, hear, taste, touch like boys. We're the same.
The same, but different.