In the mid-70s when this film was made there was - in the real world - a 'battle of the sexes' with militant feminism in full swing (if not an actual 'war', there was a lot of bruised feelings and anger in the air - witness works of fiction like 'Who needs men?' and 'The Woman's Room'); the student riots of the late 1960s were a fresh memory, as were images of Vietnam (and for British viewers, the latest IRA atrocities). Black Moon may not 'make sense', but it's more understandable as a dream, from beginning to end (forget the idea that any of it is meant to be set 'in the near future'), by a pubescent girl, subconsciously worried by the apparent war between the sexes and disturbed by her budding sexuality (note the juxtaposition of the idealised vision of heterosexual love, presented by music from Wagner's Tristan und Isolde first heard on the car radio, quickly followed by the shocking images of war).
As mentioned elsewhere, this is beautifully filmed, and IMHO captures beautifully the quality of dreams where one event follows another in a 'stream of consciousness' manner (yet with certain obsessive themes), and the dreamer does everything as if it were the most rational thing to do (as one does in a dream). On first viewing I suspected this film to be a rather self-indulgent exercise, but there's a strangely compelling quality about both the narrative and the beauty of the actual cinematography. Highly recommended.