The manifold echoes of that primitive conception of sex, and all the violent reactions that were thus evolved and eventually bound up with the original impulse, compose the streams of tradition that feed our modern world in this matter and determine the ideas of purity that surround us.
At the present day the crude theory of the sexual impulse held on one side, and the ignorant rejection of theory altogether on the other side, are beginning to be seen as both alike unjustified.

We begin to find the grounds for a sounder theory.

Not indeed that the problems of sex, which go so deeply into the whole personal and social life, can ever be settled exclusively upon physiological grounds.

But we have done much to prepare even the loftiest Building of Love when we have attained a clear view of its biological basis.
The progress of chemico-physiological research during recent years has now brought us to new ground for our building.

Indeed the image might well be changed altogether, and it might be said that science has entirely transferred the drama of reproduction to a new stage with new actors.
Therewith the immense emphasis placed on excretion, and the inevitable reaction that emphasis aroused, both alike disappear.