Our brief survey of the hygienic problems caused by sexual promiscuity and its characteristic diseases is sufficient to indicate one great problem for sex-education. Such social-hygiene problems have been most responsible for the recent and rapid rise of the movement for sex-education, and they must be recognized in any adequate scheme for instruction of young people. [Sidenote: Is sex-hygiene adequate?] Can scientific education hope to solve the sexual problems of society by inculcating such fear of venereal diseases that men will remain true to the monogamic code of morality? Many cynical disbelievers in sex-hygiene answer this question negatively by asking in biblical phrase, "Can the leopard change his spots?" In other words, these doubting ones believe that sexual instincts are so firmly fixed in the nature of _many_ men and _some_ women that there is no hope of radical change through education.[3] There is something in this point of view. It is probably true that even the most radical advocates of sex-education do not hope to secure universal monogamy and consequent disappearance of social diseases. A conservative and rational answer to the above question whether sex-education can solve the problem of social diseases, is that a large percentage of even civilized people are not yet ready to have their most powerful instincts controlled by scientific knowledge. Hence, there is no hope that the hygienic task of sex-education will be finished soon after instruction becomes an established part of general education in homes and schools. At the very best there will be incomplete returns for the social-hygienic aspect of sex-instruction, but already we know for a certainty that enough young men will be influenced to make the teaching justifiable. I feel sure of this because I have met personally many such men and my friends know many more. According to the investigations made by Dr. Exner, the medical secretary of the Young Men's Christian Association, a great reduction of venereal disease has followed sex-hygienic campaigns in college towns. [Sidenote: Medical treatment.] In another way hygienic teaching may reduce the amount of venereal diseases, and that is by leading infected individuals to seek thorough medical treatment without delay. This, of course, will render the diseased person non-infectious to others. Physicians report that there is now a marked movement in this direction and, moreover, that many infected young men voluntarily seek medical examinations before marriage. [Sidenote: Woman's need of information.]