There are, we know, two main functions in the sexual relationship, or what in the biological sense we term “marriage,” among civilised human beings, the primary physiological function of begetting and bearing offspring and the secondary spiritual function of furthering the higher mental and emotional processes. These are the main functions of the sexual impulse, and in order to understand any further object of the sexual relationship—or even in order to understand all that is involved in the secondary object of marriage—we must go beyond conscious motives and consider the nature of the sexual impulse, physical and psychic, as rooted in the human organism.
The human organism, as we know, is a machine on which excitations from without, streaming through the nerves and brain, effect internal work, and, notably, stimulate the glandular system. In recent years the glandular system, and especially that of the ductless glands, has taken on an altogether new significance. These ductless glands, as we know, liberate into the blood what are termed “hormones,” or chemical messengers, which have a complex but precise action in exciting and developing all those physical and psychic activities which make up a full life alike on the general side and the reproductive side, so that their balanced functions are essential to
