Rank #20
The Five Love Languages: The Secret to Love That Lasts by Gary Chapman
This book by Gary Chapman explores the five love languages and how they can help couples create and maintain a lasting relationship. It provides an in-depth look at how to identify and understand each of the five love languages, as well as how to use them to communicate more effectively with your partner.
From Wikipedia
The Five Love Languages: How to Express Heartfelt Commitment to Your Mate is a 1992 nonfiction book by Baptist pastor Gary Chapman. It outlines five general ways that romantic partners express and experience love, which Chapman calls "love languages". Empirical evidence does not strongly support its core claims.