to Adler believes that it is these contractions
which are principally effective in producing the voluptuous acme, and
that actual ejaculation is not indispensable. He believes, that is, that
the voluptuous acme may occur in the absence of any discharge of actual
secretion.

In any case, let us hold fast to the fact that in the adult, for the
occurrence of the voluptuous acme and of the sense of full satisfaction,
certain central processes are, in general, indispensable.

CHAPTER III

SEXUAL DIFFERENTIATION IN CHILDHOOD

In the previous chapter, I have described the differences between the
reproductive organs of men and women, and between those of adults and
children, respectively. Man and woman are, however, distinguished one
from the other, not only by differences in their reproductive organs,
but by other qualities as well, some of these being bodily, others
mental. Such distinctive characters are spoken of as _secondary sexual
characters_, in contradistinction to the _primary sexual characters_,
the reproductive organs. Our terminology would, perhaps, be more exact
if we were to regard the reproductive glands alone, the testicles and
the ovaries, as primary sexual characters; including the rest of the
genital organs among the secondary sexual characters. Havelock Ellis[11]
distinguishes, in addition to the primary and secondary sexual
characters (as commonly defined), _tertiary sexual characters_, by which
he denotes those differences between the sexes which do not attract our
attention when we compare individual members of the two sexes, but which
become noticeable when we compare the average male with the average
female type. Among such tertiary sexual characters may be mentioned the
comparatively flatter skull, the greater size and activity of the
thyroid gland, and the lesser corpuscular richness of the blood, in
women. Especially distinct are the secondary sexual characters in
respect of general bodily structure. The form of the skeleton is
different in the two sexes. Thus, in woman the pelvis is wider and
shallower than in man. In the hair also there are notable differences:
in woman the hair of the head tends to grow much longer, and woman is
much less liable than man to premature baldness; the beard, on the
other hand, is a masculine peculiarity. In woman the breasts attain a
much greater development. The larynx is in man more prominent and
longer; in woman it is wider and shallower. Woman's skin