The film Caged Women (beware there are a few by that title) (1992, http://www.imdb.com/title/tt0101534/) is one of the best Women in Prison films I have ever seen!- this from a connoisseur of the genre. I mentioned it a long time ago on this board and was surprised no one replied that they had seen it. It stars Pilar Orive- great looking, who gets naked fast and tends to stay that way through a good deal of the movie.
Where to begin.. stripped sweaty and bound on a table being handled by a lez guard, then bound on a cross for a bit of flogging. A great hosedown scene, forced stripping, girl on girl in the "hot box" being forced to lick the sweat off each other to survive. A sell off to the locals who like their goods naked, and forced girl fights/hunts for the amusement of all. This film is all that and more- someone had fun making it. Most WIP movies tend to forget why we are watching them and scrimp on the good stuff. Not this film. And best of all, the women are fine looking. If ZFX made a hard R version of the SOB series on location in a tropical prison, it would look like this.
Did I mention I like this movie?