"Perhaps in disbelief, the Orthodox Left and their younger followers could not internalize the instances when Rabbi Lichtenstein spoke out vociferously against coed mixers on the Washington Heights campus and other “progressive” YU-sponsored activities. On this particular issue, Rabbi Lichtenstein was animated to express himself in a vibrant hue. “There are certain directions in which we want the spiritual development of an individual or a society to move,” he had once explained to students. “To the best of my knowledge,” Rabbi Lichtenstein said by way of comparison, “it does not say anywhere in Shulchan Aruch that someone should not take LSD.”
From a recent article