Adults need only to recall their own youth or to observe even briefly our grammar and high school boys and girls, to be convinced that love between the sexes is one of the emotions that become conspicuously apparent in early adolescence. This is what might reasonably be expected since the emotion is derived from the sex instinct, and pubescence marks the period of rapid acceleration in the growth of the sex organs. With the increase in size and vigor of the reproductive organs there comes the strong impulse for the organs to function. Before civilization developed the system of sex inhibitions that are considered an essential part of the ethical habits of our young people, the impulse to function was not repressed and pubescence marked the beginning of the distinctively sexual experience of both sexes. This was true of primitive peoples, and is generally true of the lower races that are living to-day. It is, however, not limited to these races. A very large percentage of both sexes of the civilized races begin their sexual life during early adolescence. This is particularly true of the male half of the races. The system of sex inhibitions which has gradually been developed by civilization has been along the line of evolution and has been doing away with promiscuity, polygamy and polyandry; it has been establishing monogamy and postponing marriage until a period of greater physiological and psychological maturity of both sexes. This same inhibition of early sex functioning has lead to an increase in the prevalence of such substitutes as masturbation, onanism, pederasty, etc. Such facts bear upon the physiological results of inhibition. On the psychological side are to be mentioned courtship and those sex irradiations that have so profoundly influenced art, literature, religion, polite society, sports and industry. Many of the pathological sex psychoses, such as love for the same sex, erotopathia, sexual anæsthesia, etc., are to be explained, at least in part, by reference to the results of these social inhibitions trying to establish themselves.