I know what you’re thinking, how did this sappy book make the list?  I feel the content applies to more than your relationship with your significant other.  Your primary love language(s) also affect your relationships at work and whether you find your work life satisfying.  Just as versatility in social styles is more important to leadership than which social style you have, so do I suspect that recognizing and respecting others “love languages” can improve leadership effectiveness.  It wouldn’t surprise me to learn there is more research on this topic, maybe even in a business centric format.