Had a reasonable following for a while now.
The answers to your questions are everywhere and probably.>>10850614
Heh. Just going by what they tell me. If your engines act upon space and time directly who needs lift?
Also plenty of animals (amphibians are typical examples) can sex-change either at will or under environmental influence, and here it's not even that, girlhood is a larval stage. If we suspend disbelief enough to let the population of this planet look human that's not that much more farfetched I guess