I had this idea for a while but didn't think about details much. Since it's one of the base mechanics it will absolutely requires a lot of injections in the base code in a lot of places. I believe it's possible but will be a very difficult thing to do especially considering game code is a mess sometimes and has a bunch of outdated and even unused chunks that are still there and distract from live code. I might do it at some point but no promises.Thnks for the mod json, its really helpful.
One thing that I feel could be added and would be a cool touch of realism to the game is NPC's being able to impregnate other NPC's when having relations (vaginal) and track who is the father and stuff, I wonder if that's possible to add this as a toggle to avoid people complaining about NTR and stuff