The character names are from IMDB - the only one audible on my copy was Carole. It seems unlikely there would be two characters called Veronique.
There are some uncredited males but the video is entirely a lesbian one.
Marie Noelly and Valerie Kerine (I assume from her prominence in the story and in the credits, a blonde) are lesbians. Marie supports them both by hooking. Marie gets sent to prison for shop lifting for her girlfriend/pimp and gets drawn into the lesbian games there. Later she is persuaded to shop her lover who gets sent to the same prison where Marie is cheating on her, ... and so on.
Marie gets allocated to a cell with two brunettes (one is XNK0049, the curly haired brunette of Chantage de femmes) and XNK0094.
On arrival the blonde gets allocated to a cell with another two brunettes, XNK0050 and XNK0051 the girls who play the prison nurse and the prison visitor, respectively, in Chantage de femmes.
On release the tables are turned and the blonde turns tricks for Marie. The female warders are Laura Valérie and XNK0095 and the prison doctor is XNK0096. XNK0097 is a prisoner who takes part only in the crowd scenes, almost certainly uncredited
Étreintes and Chantage de femmes were made at the same time partly using the same location.