"In
some animals," remarks Louis Robinson (art. "Ticklishness,"
_Dictionary of Psychological Medicine_), "local titillation of
the skin, though in parts remote from the reproductive organs,
plainly acts indirectly upon them as a stimulus. Thus, Harvey
records that, by stroking the back of a favorite parrot (which he
had possessed for years and supposed to be a male), he not only
gave the bird gratification,--which was the sole intention of the
illustrious physiologist,--but also caused it to reveal its sex
by laying an egg."
The sexual significance of tickling is very clearly indicated by the fact
that the general ticklishness of the body, which is so marked in children
and in young girls, greatly diminishes, as a rule, after sexual
relationships have been established. Dr. Gina Lombroso, who investigated
the cutaneous reflexes, found that both the abdominal and plantar
reflexes, which are well marked in childhood and in young people between
the ages of 15 and 18, were much diminished in older persons, and to a
greater extent in women than in men, to a greater extent in the abdominal
region than on the soles of the feet;[16] her results do not directly show
the influence of sexual relationship, but they have an indirect bearing
which is worth noting.
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