This question of marriage is the most complicated and difficult in the whole range of Utopian problems. But it is happily not the most urgent necessity that it should be absolutely solved. The urgent and necessary problem is the ruler. With rulers rightly contrived and a provisional defective marriage law a Utopia may be conceived as existing and studying to perfect itself, but without rulers a Utopia is impossible though the theory of its matrimony be complete. And the difficulty in this question is not simply the difficulty of a complicated chess problem, for example, in which the whole tangle of considerations does at least lie in one plane, but a series of problems upon different levels and containing incommensurable factors. It is very easy to repeat our initial propositions, to recall that we are on another planet, and that all the customs and traditions of the earth are set aside, but the faintest realisation of that demands a feat of psychological insight. We have all grown up into an invincible mould of suggestion about sexual things; we regard this with approval, that with horror, and this again with contempt, very largely because the thing has always been put to us in this light or that. The more emancipated we think ourselves the more subtle are our bonds. The disentanglement of what is inherent in these feelings from what is acquired is an extraordinary complex undertaking. Probably all men and women have a more or less powerful disposition to jealousy, but what exactly they will be jealous about and what exactly they will suffer seems part of the superposed factor. Probably all men and women are capable of ideal emotions and wishes beyond merely physical desires, but the shape these take are almost entirely a reaction to external images. And you really cannot strip the external off; you cannot get your stark natural man, jealous, but not jealous about anything in particular, imaginative without any imaginings, proud at large. Emotional dispositions can no more exist without form than a man without air. Only a very observant man who had lived all over the planet Earth, in all sorts of social strata, and with every race and tongue, and who was endowed with great imaginative insight, could hope to understand the possibilities and the limitations of human plasticity in this matter, and say what any men and any women could be induced to do willingly, and just exactly what no man and no woman could stand, provided one had the training of them. Though very young men will tell you readily enough. The proceedings of other races and other ages do not seem to carry conviction; what our ancestors did, or what the Greeks or Egyptians did, though it is the direct physical cause of the modern young man or the modern young lady, is apt to impress these remarkable consequences merely as an arrangement of quaint, comical or repulsive proceedings.