Sex was absolutely not allowed to be scheduled, at least not by explicit discussion, but I had become familiar with the sequence of events likely to precipitate it: a blueberry muffin from Blue Sky Bakery, a triple shot of espresso from Otha’s, removal of my shirt, and my impersonation of Gregory Peck in the role of Atticus Finch in To Kill a Mockingbird.
-- Narrator (Chapter One paragraph 3)

Importance: Although sexual intercourse was the one thing in Rosie and Don’s relationship that wasn’t supposed to be scheduled, there were certain things that Don did that would preclude sex. Don’s inability to schedule sex was significant because he like to schedule most everything about his life with his wife, Rosie.

Once again, I was struck by her extraordinary beauty and inexplicable decision to select me as her partner. And, as always, that thought was followed by an unwanted emotion: an intense moment of...
-- Narrator (Chapter One paragraph 9)