"[114] From a very different standpoint, Fere, in studying the
pathology of the human sexual instinct in the light of a very full
knowledge of the available evidence, states that he knows of no detailed
observations showing the existence of any morbid sexual perversions based
on the sense of hearing, either in reference to the human voice or to
instrumental music.[115]
When, however, we consider that not only in the animals most nearly
related to man, but in man himself, the larynx and the voice undergo a
marked sexual differentiation at puberty, it is difficult not to believe
that this change has an influence on sexual selection and sexual
psychology. At puberty there is a slight hyperaemia of the larynx,
accompanied by rapid development alike of the larynx itself and of the
vocal cords, which become larger and thicker, while there is an associated
change in the voice, which deepens. All these changes are very slight in
girls, but very pronounced in boys, whose voices are said to "break" and
then become lower by at least an octave. The feminine larynx at puberty
only increases in the proportion of 5 to 7, but the masculine larynx in
the proportion of 5 to 10. The direct dependence of this change on the
general sexual development is shown not merely by its occurrence at
puberty, but by the fact that in eunuchs in whom the testicles have been
removed before puberty the voice retains its childlike qualities.
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