Needs without corresponding desires have grown increasingly common as life has grown more different from that primitive existence from which our instincts are derived, and to which, rather than to that of the present day, they are still very largely adapted. An unsatisfied need produces, in the end, as much pain and as much distortion of character as if it had been associated with a conscious desire. For this reason, as well as for the sake of the race, it is important to remove the present economic inducements to childlessness. There is no necessity whatever to urge parenthood upon those who feel disinclined to it, but there is necessity not to place obstacles in the way of those who have no such disinclination. In speaking of the importance of preserving seriousness in the relations of men and women, I do not mean to suggest that relations which are not serious are always harmful. Traditional morality has erred by laying stress on what ought not to happen, rather than on what ought to happen. What is important is that men and women should find, sooner or later, the best relation of which their natures are capable. It is not always possible to know in advance what will be the best, or to be sure of not missing the best if everything that can be doubted is rejected. Among primitive races, a man wants a female, a woman wants a male, and there is no such differentiation as makes one a much more suitable companion than another. But with the increasing complexity of disposition that civilized life brings, it becomes more and more difficult to find the man or woman who will bring happiness, and more and more necessary to make it not too difficult to acknowledge a mistake.