lity for sexual
actions that concern future generations.

Here are the eight sexual problems of our times. Any one of them has
significance great enough to demand the attention of educators and
social reformers. One and all they point to the need of better
understanding regarding the sexual functions and their relation to
life. I shall now turn to outline the main facts concerning each of
these sexual problems so far as it seems likely that they will concern
educators and social workers. For convenience I shall use the following
brief headings: (1) Personal sex-hygiene, (2) social diseases, (3)
social evil, (4) illegitimacy, (5) sexual morality, (6) sexual
vulgarity, (7) sexual problems and marriage, (8) eugenics.

[Sidenote: Historical order.]

These sexual problems toward whose solution special instruction of
young people may help are stated here in the order in which they have
attracted attention as reasons for sex-education. Thus, for instance,
personal sex-hygiene was the chief reason recognized twenty years ago;
social diseases began to attract public attention ten years ago;
commercial prostitution has been especially prominent in the
discussions of the past five years; and only recently has there been
emphasis on sex-education with reference to eugenics.

The historical order which I follow in this lecture is not now the
order of greatest importance. For example, sexual morality (5) and
vulgarity (6) are probably of far greater significance than any of the
other sexual problems that offer arguments for sex-education.

[Sidenote: Not all sex problems concern youth.]

To avoid possible misunderstanding, let me repeat from the first
lecture the proposition that sex-education should extend in home and
school from childhood to maturity. It follows that these lectures
concerning the problems of sex that seriously affect the human race are
not all applicable as arguments for instruction in schools or for
children of school age. Some of the problems of sex point to the need
of special instruction in pre-adolescent or in adolescent years, but
some of them concern directly only those who are approaching maturity.

Sec. 6. _First Problem for Sex-instruction: Personal Sex-hygiene_

[Sidenote: Personal and social hygiene.]

It is convenient to group under personal sex-hygiene all hygienic
knowledge concerning sexual processes in their personal as
distinguished from their social aspects. The distinction between th