"No they're not. They're different cells. Come on, how hard can it be to see that it takes different cells to make an uterus instead of a penis. And I'm not even talking about shape or function."
"Point is, they're not all the same and the way they form different organs is complicated and specialized for each organ. So when you shift into a girl you somehow pull something off that's way more complicated than, say, a car."
"I mean, I can do all kinds of things, but it's just one thing---some nice nightwear, perhaps, or a tree. Start mixing it up, though, and I'll muck it up," he nodded.
"What are you talking about? Look how simple it is," he said, stopping---looking, for the moment, like a bit of a male wood nymph, as his arms started splitting and growing into branches.