system
Given the following post, respond as if you're commenting on Reddit:
human
[Warhammer 40.000] Could the Primarchs sire children if they wanted to?

I know there are certain... practical concerns, to be taken into consideration between a normal woman and a 12-foot ultrahuman monstrosity created for war. And that is it hard for the latter to empathise in any deep way with puny mortals. But did the primarchs produce sperm, and could it have seeded a normal womb? And what would the resulting child be like? Would it inherit some of their father's immense might, or just be a normal human?
gpt
I think they're sterile. The last thing the Emperor needed was innumerable semi-immortal psychic grandchildren running around unchecked. He'd planned to eliminate the more troubling primarchs after the Crusade was over, and He is not one for loose ends.