From Annie Dillard's The Maytrees:
After they married she learned to feel their skin as double-sided. They felt a pause. Theirs was too much feeling to push through the crack that led down to the dim world of time and stuff. That world was gone. They held themselves alert only in those few million cells where they touched. She learned from those cells his awareness and his courtesy. Love so sprang at her, she honestly thought no one had ever looked into it. Where was it in literature? Someone would have written something. She must not have recognized it. Time to read everything again.