“What are some relatively recently written books that aren’t about meditation but will make serious meditation go more smoothly?”
[in no particular order; these books are not perfect; for some categories I might have chosen better, but a few are unique and excellent even if flawed]
Wired for Love: How Understanding Your Partner’s Brain and Attachment Style Can Help You Defuse Conflict and Build a Secure Relationship by Stan Tatkin
[this one is recommended for the principles, which are stratospherically, superlatively good. everything else, side-eye]
Arousal: The Secret Logic of Sexual Fantasies by Michael J. Bader
How We Die: Reflections on Life’s Final Chapter by Sherwin B. Nuland
Everyone Poops by Taro Gomi
https://www.amazon.com/Everyone-Turtleback-School-Library-Binding/dp/0613685725/
How We Live by Sherwin B. Nuland
https://www.amazon.com/How-We-Live-Sherwin-Nuland/dp/0679781404/
Cult: A Love Story by Alexandra Amor