[You're impossible. The only part that's odd is that they're human.]

For the same reason you're human, I assume. I doubt there's any way to correctly translate a non-organic, non-biologically sexed species into just that, so a random element to which sex is chosen during a species... change doesn't seem all that unreasonable.

[Starscream will merely get that stare back as Jetfire starts... theorizing.]

Why does it matter, either way? Neither of us are what we're supposed to be.