Although it is quite dated and a lot of it revolves around sex, I rather liked Zen Without Zen Masters.
Most things revolve around sex
You could say that one some level most things revolve around the base of Maslow's Hierarchy of Needs, but that would just be stating the obvious.
On an intellectual level, most adult people are able to move past brainstem-level drives and contemplate topics that are more abstract than fucking, staying warm, and shoving food into their faces.