I'm kinky, poly and queer and I found this book to be useful. Yes, it's garnished with biblical quotes and marriage elitism but the five love languages I believe can be relevant to everyone nevertheless.
It kind of reminds me of the Myers-Briggs personality tests - remember those? They helped us measure how social and how intro/extroverted we are, etc. Well, it's kind of like that in this book. The author gets us to explore how we prefer to be loved so that we can communicate it better to our partner(s). Are you more likely to feel loved through touch? Gifts? Acts of service? Quality time? Loving words? A combination? Which one? What does it look like for you? What about your partner/s? Here's a whole new way to have a conversation about wants and needs!
Another tool in my toolbox!