A few of the characters go completely nude, including the main character, who spends about 2/3 of the movie wearing nothing but a sort of body paint. Many of the female characters go topless.

There are a few sex scenes.

Cannibalism is shown. A man is shown eating a hand of a human.

There are several fighting scenes in the movie. People are stabbed with stone blades, clubbed, shot with arrows, and smashed by rocks wielded as weapons. In a particularly grisly scene, an ape-man is impaled through the mouth with a spear.

In one scene, we see blood squirting from a wound.

A man's genitals are viciously bitten.

A man is mauled by a bear.

Of the sex scenes mentioned above, one is clearly a rape, and another is a borderline case.

All of this serves to advance the plot, rather than portray violence for its own sake.

Not a word.

None.

Many very intense scenes where the 3 main characters end up in peril during their journey. Much of this is amplified by the equally intense music.