Some just so terribly non-PC stuff from the master, G.K. Chesterton, addressing the then-current (1930s) panacea of coeducational schooling in an essay titled Two Stubborn Pieces of Iron:
The school will never make boys and girls ordinary comrades. The home does not make them that. The sexes can work together in a school-room just as they can breakfast together in a breakfast-room; but neither makes any difference to the fact that the boys go off to a boyish companionship which the girls would think disgusting, while the girls go off to a girl companionship which the boys would think literally insane. Co-educate as much as you like, there will always be a wall between the sexes until love or lust breaks it down. Your co-educative playground for pupils in their teens will not be a place of sexless camaraderie. It will be a place where boys go about in fives sulkily growling at the girls, and where the girls go about in twos turning up their noses at the boys.
Now if you accept this state of things and are content with it as the result of your co-education, I am with you; I accept it as one of the mystical first facts of Nature. I accept it somewhat in the spirit of Carlyle when somebody told him that Harriet Martineau had “accepted the Universe”, and he said, “By God, she’d better.” But if you have any idea that co-education would do more than parade the sexes in front of each other twice a day, if you think it would destroy their deep ignorance of each other or start them on a basis of rational understanding, then I say first that this will never happen, and second that I (for one) should be horribly annoyed if it did.