I just thought of something. In Get to Work, if a townie comes in for labor and delivery, the game randomly assigns a sperm donor from the sims in the world. I use the term donor because the townie and the donor don't necessarily have any relationship at all, not even casual. The child can end up with some features of both parents. So the effect is similar to a Baby Bank, but it happens at random to some townie, rather than being a choice you can make for your active sim. I'm just saying that the code for handling the donor aspect should already be there.