His Needs, Her Needs: How to Affair Proof Your Marriage by Willard, Jr. Harley. Plain language about taking care of each other's needs and promoting a satisfying marital relationship.

Men Are from Mars, Women Are from Venus : A Practical Guide for Improving Communication and Getting What You Want in Your Relationships by John Gray

We Love Each Other, but : Simple Secrets to Stregthen Your Relationship and Make Love Last by Dr Ellen Wachtel

The Divorce Culture : Rethinking Our Commitments to Marriage and Family by Barbara Dafoe Whitehead