The hope for intimacy lies deep within us all. That moment of feeling uniquely understood, the antidote to isolation, is what gives us value, validation and self-belief. But as Ziyad Marar shows in this fascinating and engaging study, intimacy is a tricky business.

The prevalence of social media, for example, is a sign of our desire for human connection, yet is a symptom of how little we truly achieve it. Often confused with love, intimacy is in many ways more important. Marar's investigation...