Why do women nag?
Well, Here is what I think .
Women don't like being ignored , plus they like having their way all the time.
So, when they feel ignored and can't seem to get what they want when they think you clearly have the power to grant them their wish, they take on to their arsenal and bring out one of the most annoying weapons: Nagging.
They believe this works since it has been working from time immemorial. So you clearly see why they nag.
SideNote: They also feel frustrated when it seems you are now immune to their nagging. Meaning it's more like a weapon of last resort for them. Beyond that, all they seem to have left is Prayer to God.