The full movie is Lesbiennes en prison (Lesbians in prison) and you can find the whole movie if you look hard enough. The final scene between two guards and the brunette is really hot.
Saw this as a VHS video a long time ago, this is just a short clip, there is a 'story' (of sorts) to the video and some more realistic scenes: we got off to it a lot of times, but here this clip looks a bit dated, maybe good if you haven't seen the whole thing.