1. For Women Only by Shaunti Feldhahn
Shaunti's book is short enough to read in one sitting, and she offers real insight into the inner workings of your guy! I reread this at least once a year or so. Shaunti and her husband Jeff have also written For Men Only, which I also recommend. They were able to put into words things about women I had never seen in any other "marriage" book, and which I couldn't begin to explain to my husband.
2. Always by Betsy Holt & Mike Yorkey
A collecion of inspiring real-life stories by couples who have struggled through some of the worst things life can throw at a marriage (incompatability, illness, adultery, financial difficulties, the death of a child). I liked these stories because the people in them are real- not the "perfect Christians" you sometimes find in this type of book. Although it has been a long time since I've read this book, I still find myself thinking back on some of these accounts and thinking, "If God can do that, then he can certainly do this!"
3. Becoming One: Emotionally, Spiritually, Sexually by Joe Beam
Hands-down, the best book I've ever read on marriage. Joe goes way beyond "treat your husband with respect" and "give your wife affection". One cornerstone of his advice: "Have Hotter S~x" (sorry... don't want my blog to get visited by those kind of spammers...) Joe rocked the boat on The Today Show last fall with this message (apparently, Christians have a reputation for being fuddy-duddies. Can you imagine?) Check out this article on MSNBC to see what Joe has to say!
4. His Needs, Her Needs by Willard F. Harley
It changed our marriage when we read this 13 years ago or so. It's become a "classic" now, and well worth the read!
5. Letters to Karen by Charlie Shedd
This is the first "marriage" book I ever read; I discovered it on the family bookshelf when I was a teen, and adopted it for my own. It's a collection of letters from a father to his daughter as she is preparing for marriage. Oh, it discussed s~x, and a lot of other things as well (but in a way you probably wouldn't mind an older teen reading). It formed a good bit of the foundation for my views of marriage, and helped me know what to look for in a mate (and clearly, it worked! :-) It's still a wonderful read.
What books have had a positive impact on your marriage?