I know this is not Jesus Franco's best work of art, but I really enjoyed watching the girls in the movie, especially the tall one with the black hair, she looks so much like Gisele Bündchen, her name is Rosalba Neri, she is Italian, if you are digging her, here are some more info.
http://www.imdb.com/name/nm0626219/
http://en.wikipedia.org/wiki/Rosalba_Neri
The reason I recommend this movie is because of the beautiful girls, I'm still wondering how could Franco get so many beauties working on one movie, but the movie itself is not that great for "the girls in prison" genre.
So don't watch it, if you are not for the girls.