​Here are some books I frequently recommend and find to be helpful

A Lasting Promise: The Christian Guide to Fighting for Your Marriage (January 13, 2014) 

by Scott M. Stanley, Daniel Trathen, Savanna McCain, B. Milton Bryan 

The Sex-Starved Marriage: Boosting Your Marriage Libido: A Couple's Guide 
Paperback – January 8, 2004 

by Michele Weiner Davis

The Way to Love Your Wife: Creating Greater Love and Passion in the Bedroom (Mar 1, 2007)

by Clifford L. Penner and Joyce J. Penner
A Celebration of Sex for Newlyweds (2005)

by Rosenau, Douglas