These contradictions are only apparent and result from two facts: first, that the words sex or sexual instinct and love are used indiscriminately and interchangeably as if they were synonymous terms, which they are not; second, there is failure to bear in mind the essential differences in the natures and manifestations of the sexual instincts in the male and the female. If these differences are made clear, the apparent contradictions will disappear. The outstanding fact to bear in mind is that in man the sex instinct bears a more sensual, a more physical, a coarser and grosser character, if you have no objection to these adjectives, than it does in woman. In women it is finer, more spiritual, more platonic, to use this stereotyped and incorrect term. In men the sex manifestations are more centralized, more local, more concentrated in the sex organs; in women they are more diffused throughout the body. In a boy of fifteen the libido sexualis may be fully developed, he may have powerful erections and a strong desire for normal sexual relations; in a girl of fifteen there may not be a trace of any purely sexual desire; and this _lack_ of desire for _physical_ sex relations may manifest itself in women up to the age of twenty or twenty-five (something that we never see in normal men); in fact, women of twenty-five and even older, who have not been stimulated and whose curiosity has not been aroused by novels, pictures, and tales of their married companions, may not experience any sexual desire until several months after marriage. But while their desire for actual sexual relations awakens much later than it does in men, their desire for love, for caresses, for hugging, for close friendship, for love letters, awakens much earlier than in men, and occupies a greater part in their life; they think of love more during their waking hours, and they dream of it more than men do. A man--always bear in mind that when speaking of men and women I always speak of the average; exceptions in either direction will be found in both sexes--a man, I say, will generally tire of paying attentions to a woman if he feels that they will not eventually lead to the biologic goal--sexual relations. A woman can keep up with a man for years without any sexual intercourse, being fully satisfied or more or less satisfied with the sexual substitutes--embraces and kisses.