Based on Elizabeth Bernstein’s Wall Street Journal article, Nagging: Meet the Marriage Killer
Once again – there is good and bad news. Starting with the latter….
Nagging — the interaction in which one person repeatedly makes a request, the other person repeatedly ignores it, and both become increasingly annoyed — is a toxic communication issue that is one of the leading causes for discord and divorce. We nag when we feel we can’t get what we want from our partner, and we keep on asking in the hopes it will happen. A vicious cycle is set in place: The irritated recipient of the nagging, feeling scolded like a little boy, withdraws in protest, inviting the nagger to nag some more.
In a 
Children who misbehave usually do so for a purpose, taught U.S. psychiatrist and educator Rudolf Dreikurs. Misbehaving children and teens are acting out a feeling or need that they are unable to convey or express. Such a need might be: a need for attention when s/he is feeling ignored or neglected; a resentment over being controlled; a fear that s/he is not loved or lovable; or a feeling of inadequacy or helplessness.

From the New York Times 
A new State of Our Unions report (entitled “When Baby Makes Three”) from the National Marriage Project (NMP)* at the University of Virginia and the Center for Marriage and Families draws on data from three nationally representative surveys (2,870 couples in total) to answer four important questions about contemporary family life: