I have a huge bookshelf filled with amazing, educational, and inspirational books about life & relationships. I'll continue to put some here, and endeavour to update them as I read and love more.
I invite you to consider also reading some that are adjacent to what you're looking for because often there's magic in learning things you never knew you needed.
I also urge those of you in monogamous relationships to read within the consensual non-monogamy category as the processes and tools in those are absolutely gold standard for couples communication.
Self Esteem & Body Image
Couples Therapy - For Therapists & Relationship Nerds
The Shit List
Don't read these, they perpetuate awful stereotypes and provide little useful information for this (or any) era. And in the case of the Nicole Daedone book... go listen to The Orgasm Cult