One of the things I don't like in ck2 is large sprawling families that happen without trying. I feel like there should be a button where you toggle your character and their spouse(s) to try for babies. This could help especially when your character has gavelkind, or you could gamble and try to get another daughter but then lose titles to gavelkind if a boy is born instead. If the characters weren't actively trying for a child they would have a very reduced risk of having a child, and could possibly expose scandals if your character investigates.