Here are a few links and books on intimacy for your exploration

Wikipedia article on Intimate Relationships 
A rich source of historical and academic information, well-footnoted, with links to many related terms.

Types of Intimacy Article

RULER: a way to learn about communication

Sexual Health 
A one-stop shop for information (Canada)
       The biggest sex organ is not between the legs.

Healthline on Intimacy 
A health-related perspective.

Rekindling Passion
    “A good sexual relationship is built on emotional intimacy and closeness.”

15 Books All Couples Should Read, According To Marriage Therapists

  • The Art of Loving by Erich Fromm (online PDF)
  • Mating In Captivity: Unlocking Erotic Intelligence. Esther Perel
  • The Normal Bar: The Surprising Secrets of Happy Couples and What They Reveal About Creating a New Normal in Your Relationship. Chrisanna Northrup, Pepper Schwartz, James Witte.
  • Attached: The New Science of Adult Attachment and How It Can Help You Find -- And Keep – Love. Amir Levine and Rachel S.F. Heller.
  • Getting the Love You Want: A Guide for Couples. Harville Hendrix and Helen LaKelly Hunt.
  • How to Make Love All the Time. Barbara De Angelis.
  • The New Rules of Marriage: What You Need to Know to Make Love Work. Terrence Real.
  • The ADHD Effect on Marriage; Understand and Rebuild Your Relationship in Six Steps. Melissa Orlov.
  • Conscious Loving: The Journey to Co-Commitment. Gay Hendricks and Kathlyn Hendricks.
  • The 5 Love Languages: The Secret to Love That Lasts. Gary Chapman.
  • Hold Me Tight: Seven Conversations for a Lifetime of Love. Sue Johnson.
  • Marriage Meetings for Lasting Love. Marcia Naomi Berger.
  • Crucial Conversations: Tools for Talking When the Stakes Are High. Patterson, Grenny, McMillan, Switzler.
  • Emotionally Focused Couple Therapy For Dummies. Brent Bradley, James Furrow.
  • The Seven Principles For Making Marriage Work. John M. Gottman and Nan Silver.

The Dance of Intimacy; A Woman’s Guide to Courageous Acts of Change in Key Relationships, by Harriet Lerner.  New York: Harper & Row, 1989.

The Intimate Marriage. Howard and Charlotte Clinebell. (online PDF)