Looking for a French movie from the early 80's. I think it had English dubs. Two blond girls living in an apartment. There are scenes with just them and also with two guys. The girls almost seem to be their "slaves" as they're always in the apartment and the two guys always have their way with them. Just to help narrow it down, I think one of the girls was knitting at times for some reason. Let me know if you know the name of this movie.