This book builds on the biblical foundation laid out by Paul in Ephesians chapter 5. The author posits that what men need is respect, and what women need in a relationship is love.
Might i mention unconditional respect, and unconditional love.
He builds out a framework for how to do this. For the men to show love to their wives: the acronym COUPLE. For women to respect their husband: CHAIRS.
This brief in combination with the 5 Love Languages brief are powerful aids we think.