Nagging, to put it simply, is often an attempt to control the behavior of another person. It would be foolish to say men don’t do it, but it does seem to be a predominantly female trait. The trouble is that it’s a negative feedback loop – nagging most people creates a standoffish, defiant attitude, which in turn acts to make it even less likely that the desired behavior will occur. I would disagree with the poster who said that those who nag do so from a lack of other things to occupy them – many such people I’ve known were very busy indeed. Lacking another more effective method, though, people will resort to nagging in an effort to modify the actions of others.