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The emperor's already fucked up, without any extra women. His genius confirmed at least Bale, and this dude looked at Slaanesh personally and said to his face, "You're not gods at all, you're shit," and then made two perfect copies of primarchs. And you believe him for some reason.
Impey and since a politician, a father and just a logical person have been omitted since the time of his decision on Argorne and anyone who has even a little bit of interest in lore knows how fucking Impy is.

But take away his genetics? What's next, for psiker stuff, did he carry some woman in a bag with him?

The universe is not childish, stop it. There's a nursery in the canteen. It's ridiculously childish. DND is generally a funny children's universe. Waha is much higher in level.