“Pornography: The Secret History of Civilization” (2005) is useful for showing that non-procreational sex and sexual enjoyment are not “modern,” and that using and enjoying sexually explicit images isn’t new, either. I liked the first two episodes in the series, especially the second one, which shows how many explicit images there are in religious buildings and texts from the Middle Ages in Europe. Be warned, you need to watch these before showing them to be sure you can get away with it with your audience–for many students, even the artwork and religious drawings would probably lead to outrage today (which can be an interesting discussion in and of itself).
“Fenceline” addresses institutional racism, environmental pollution, and activism by looking at residents in a town in Louisiana and the divisions that arise between blacks and whites about the possibility of toxic waste contamination. It could be useful for discussing environmental issues or looking at why two groups in the same community could come to such different conclusions about what is going on.