Locutus of Bored wrote:
The decision to stop natural procreation was a fairly recent one (relative to Kryptonian history) and related to overpopulation concerns. Why would they neuter themselves? What if the population stabilized and they wanted to return to the old way of doing things?
I believe that something consistent with everything we saw, that wasn't addressed, and that would probably be quite reasonable, would be that Kryptonians were sterile due to the presence of some contraceptive in their systems. As the preeminent scientist, perhaps Jor-El then counteracted that in himself and Lara?