DON'T: Consider books about relationships the Bible.
As you'll see in the movie, Think Like a Man, some pretty crazy stuff can happen if you base everything in your relationship around a book. So, use the book to get knowledge. But, talk about things with your partner—there's that pesky "communication" again!—so that you're both on the same page at all times. If you can do that, you should have no problem at all sustaining a long-term relationship. Good luck!