system
Given the following post, respond as if you're commenting on Reddit:
human
[Man of Steel]Why were Kryptonians paring up and having children such a rare occarence?

Going by Zod's reaction, it is as if this has never happened before. Why are Jor-El and Lara the only couple around? Are we to assume that they geneticallly engineer the male and females so that they have lower sex drives? Also, if there are more couples, how would they stop them from wanting to have children, like what Jor-El and Lara did?
gpt
By the end, Krypton society has largely view natural birth as barbaric and primitive. It unnecessarily endangers the mother and leaves too much up to genetic chance for a Kryptonian child to not developed genetic defect. Artificial wombs eliminates those risks and also via genetic manipulation specialized Kryptonians to fill in the needs of Krypton as a whole.