I watched this movie incidentally on Spanish TVE, Sunday late at night many years ago, and it planted a disturbing but lasting effect in my mind. Every now and then I look for the film in the internet, or in every TV channel I can get home, but to no avail. I didn't see it from the beginning. I recently saw "Bob, Carol, Ted & Alice", the "established" Paul Mazursky's portrait of that era of free love and "strange" personal and group behavior, later remodeled somewhat into "new age". I still don't know if "Bob..." was ironic in its happy feelings. "Glass Houses" was fully tragic and more accurate I think. French writer Michel Houellebecq has described well the French equivalent to this in his book "Les particules elementales" (don't know the English title, but sure it's very similar).