So, mummy. There are all sorts of families. We have a Mum and a Dad and a kid. But families with two mums – or two dads…
Yes?
Well, they’d need to borrow an egg or a sperm to get their babies going, right?
That is true.
But the 2 dads – they would need more than an egg – they would need to borrow a whole woman to grow the fetus, right?
Yes – that is called a surrogate.
Oh, that is good. It is also a good thing that it all works this way.
Why is that?
Well, if you didn’t need both the egg and the sperm, babies would have to just start growing – you know, spontaneously.
[Pause]
And that would be bad.
Whither Earthlings 