Occasional topless indigenous women, briefly shown though sometimes prominently visible.
The penultimate episode documents a birth, and everything is shown in close to real time, lasting for a couple minutes. The same episode discusses the phenomenon of human sex directly for several minutes, mentioning the orgasm, and showing (mostly abstract) art depicting copulation.
In episode one, a naked toddler is shown learning to walk, his bottom and penis clearly visible. The scene has an anthropological feel, being accompanied by an excerpt from Barber's Adagio for strings.