Oh man, the Golden Age of science fiction movies, just two years after 2001: A Space Odyssey and five years before the start of the Blockbuster era[0] with Jaws (1975) and Star Wars (1977).
I feel like Science Fiction back then was purely understood as psychological concepts and ambiguous desires, mostly questioning the very essence of reality and our human minds. There were intelligences and ambitions in us that felt alien, but weren't extraterrestrial in kind. I always thought of it as if Science Fiction tried to turn any progress from the Age of Enlightenment inside out.
A great gem is also World on a Wire (1973)[1], which takes the concept of a machine controlled intelligence and questioned whether we're living in a simulation and are already influenced by a virtual world.
My favorite quote from Colossus: The Forbin Project, after Dr. Forbin is held hostage by Colossus:
Colossus: How many nights a week do you require sex?
Dr. Forbin: Every night.
Colossus: Not want. Require...
Dr. Forbin: [looks sheepish] Four times.