I hear many questions as to the probable future of sex-education. I am asked: "Is it moribund?" "Is it a disappearing fad?" "Has not the high tide of interest passed?" No doubt such questions are inspired by the oft-repeated statement that public interest in sexual questions has waned decidedly in the last few years. This is true, and it is a most fortunate indication of approaching sanity. The public interest in the last decade has been most deplorable, because it has centered in the abnormal and sensational aspects of sex. Authors have vied with each other in presenting the most lurid cases of social diseases, white slavery, sexual perversions, and every other available aspect of sexual degeneracy. Of course, the reading public was bound to grow tired of this, just as it wearies of a horrible murder trial or of a sensational divorce case. It is certainly true that there is a marked decline of general interest in sexual abnormality and sensationalism; but that does not mean that the sex-education movement is moribund. [Sidenote: Sex-education permanent.] The wave of sensational revelation has passed; but the intelligent public is no longer ignorant of the nature and causes of the great problems of sex, and is well aware that young people need definite guidance for facing the facts of life. It is unthinkable that intelligent parents who are now well informed concerning sex will ever again stand for the old policy of mystery and silence. It is, therefore, impossible to believe that there is any danger of sex-education disappearing. Of course, we have not reached a permanent system of sex-education. There certainly will be vast changes in our approved subject matter and methods of teaching; but the main idea of the sex-education movement is gaining support every day. [Sidenote: Sex-education fundamental.] There is another reason why sex-education will be permanent. In addition to the great need of educational help with information and influence which will mold the individual life with regard to the problems of sex, it must be evident to all that even the legislative, sanitary, social administrative, religious, ethical, and other attacks upon the problems depend upon knowledge and attitude, at least of the leaders. Look at the problems of sex outlined in the earlier lectures from whatever angle we will, and it appears that, in the final analysis, education offers the only key to a possible solution. Therefore, I assert that sex-education--the larger sex-education--is an absolutely fundamental factor in every phase of the social-hygiene and sex-ethical movement. [Sidenote: Ultimate effect of sex-education.]