The Ascent of Man (1973)

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.

In episode one, reindeer are shown being castrated and later skinned by Lapplanders.

In episode two, riders on horses drag a beheaded animal's carcass around in a game of Buzkashi, a tribal war game.

The eleventh episode discusses the Holocaust.

In episode two, a nomadic tribe leaves an old man to die who is too feeble to continue travelling with the tribe.