When the "safety nerves" are in action the pupil is dilated, the saliva scarce, the heart beats faster, gastric activities cease or become reversed (vomiting), the intestines either stop their activity or are affected by diarrhea and the sexual organs are emptied of blood. Any stimulation applied to any of those organs will produce the specific stimulation indicated above in ALL THE OTHER ORGANS, tho in varying degrees. In other words perfect peace and safety promote all the activities of the "life nerves," danger and fear promote all the activities of the "safety nerves." Peace and safety build up the body and assure the continuance of the race. Danger and fear stop all the activities which are not directly concerned with fight or flight, hence weaken the organism and stop the sex life. Peace and safety represented by the mental and physical fetishes of the mate toward whom we are driven by an organic compulsion are bound to produce in us most gratifying results. The sight, smell and taste of good food, the sight of pleasant objects, the sound of good music, etc., produce a powerful stimulation. =Love's Stimulation=, reaching us, as we shall see in another chapter, thru all the senses and thru a thousand memories, is incomparably more powerful than that of any other craving. Nutritious food in sufficient quantities is generally synonymous with good health. Improper food in insufficient quantities is generally synonymous with bad health. The mental connotation of good and bad food, however, is far from being as important as the mental connotation of love or lack of love. There are besides the sexual factors, such tremendous egotistical factors in the love life (as will be shown in Chapter VIII,) that love is the most powerful stimulus known and the lack of love or the loss of love the most terrible depressant for the human organism. =The Successful Lover= has a good appetite, regular heart action, (hence a healthy complexion); he enjoys sleep undisturbed by nightmares, is capable of continued effort (good thyroid action), has firm muscles (regular adrenal section), is self-reliant, etc. In other words his organism is working on a hundred-per-cent basis and under the influence of that stimulation he can accomplish tasks which, under any other circumstances, would appear too difficult, and understand things which under the influence of a sluggish thyroid or bowels would have appeared very obscure. People indifferent to physiology might attribute some of love's magic results to "inspiration," to "spiritual uplift" and other vaguely conceived factors of a romantic and sentimental nature. I am always reminded when encountering such explanations in the literature of love, of the nuptial flight of the bee.