>>533976275
>>533976275
There's a series in his ci-en where Iron Maiden, the first boss battle of the game, talks about the Shrift world to tell subscribers about things that aren't important to the story of the game. One of them is that interspecies breeding is bervoten in among demons. The dev will even refuse requests to draw art of the girls impregnated by Kazuya since his shrift commissions must be strictly in-character.
And though I would agree with >>533979597 there's probably more than the social stigma.
For example, all the girls in chapter 1 had their bodies modified or were created from scratch by Hecate so they might not even be able to reproduce at all. Also Haru is so stupid that she would have gotten pregnant if she could in her epilogue.
Others reproduce non-sexually, like the harpies and Echo.
Then the rest are probably not interested in having kids. Arachne is self-indulgent and already hates it when she falls in love with Kazuya, Titanoboa lost her kids and her mind last time she became a mother, and Hecate seems too evil and proud to bear someone's child, let alone a human.