I'll not beat around the bush: this is a novel about sex (incest in particular), spanking or cutesy threats thereof, and, tangentially, aging.

Despite the promising premise of a two thousand year old main character, Heinlein's flaws as a writer are as present as ever:

- An ever-monologuing character who mansplains everything about the world
- Flat and stereotyped women
- A variety of dated moral axes to grind
- Lack of a meaningful plot arc, just a series of events

I enjoyed myself at times, but overall this is not a worthwhile read, even for a Heinlein fan.