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I guess it could have been any or all of those factors. I'd like to offer one further possibility, as far-fetched as it may be.I've always been very curious as to why exactly they made the plague gender-specific. Were a majority of the power-holders male? Did they (mistakenly) think planets full of women would make easier targets? Was it just easier to target the Y chromosome? Was the specificity a failsafe to ensure that there would still be 50% of the colonists left to subjugate?
That's to the point... this reasoning has inspired my own Sci-Fi concept. We'll see whether it turns into a webcomic or whatever else.Biologically speaking, with humans the maximum rate of population growth has more to do with the number of women than the number of men. A single man produces sufficient amounts of gametes to impregnate quite a number of women in a relatively short amount of time, while a woman is indisposed at least nine months per ~1 child. With a sperm bank and a large amount of women, potential population growth rates can be higher than they might be if the women were less. So, men are more expendable when it comes to repopulating the conquered planets.