While this film is certainly an anomaly, I find it insane when people try to call this Dusan Makavejev's true masterpiece over Sweet Movie. While Sweet Movie is a thoroughly absurd, surreal, artistic masterpiece unlike anything I've ever seen, and one of the only films that has truly shaken me up since I hit my 30's, Mysteries of the Organism feels more like a plain-old documentary that chooses to focus on a very peculiar subject matter, with excerpts of narrative fiction spliced in that feel like they have almost nothing to do with the topic, and quite frankly don't add much to the experience, aside from one memorable (and relatively jarring) sequence towards the end of the film.
The title of the movie feels kind of comical after viewing, because it seems very obvious that the true title should be Mysteries of the ORGASM, as that's what the majority of the doc is about: the orgasm and obscure sexual practices. I'm not sure WHO I would recommend this to, but it's certainly a one-of-a-kind viewing. I will always think of one particular sequence, where the movie observes a cult-like group session in which participants practice specific breathing methods that lead to...somewhat frightening climaxes...