I assume from the title and timing (IMDB gives few other details) that this is the same "Extremes" I remember seeing in the early 70s. If so, it is a rather tacky documentary in the Mondo Cane tradition. I saw it for the scenes of the 1970 Isle of Wight festival, which I attended, but they were presented along the lines of "look at the naked hippies doing funny things". Nothing else in the film has stuck in my memory. Not worth spending much time on.
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