The slaves are shown nude for a majority of the film. Front and back.
Rape is depicted frequently.
the slaves are forcibly given enemas.
Naked children and naked babies.
A master attempts to have sex with a 13 year old wench, and rejects her when he discovers she is a virgin. She then comes on to the man behind the camera, so far as to strip off her clothes. Breasts VERY visible. At the end of the scene, it is HEAVILY implied that the man behind the camera sleeps with her.
There's a castration scene, but it happens off screen. At one brief point, the camera zooms in on a young man's penis, which he quickly covers with his hands.
There is a slave auction where slaves are paraded around fully nude. The female wenches are made to bare their breasts.
Seen in the shadows: a doctor holds up a slave's johnson by forceps