It is, as it were, a play of tumescence, on which
laughter supervenes as a play of detumescence. It leads on to the more
serious phenomena of tumescence, and it tends to die out after
adolescence, at the period during which sexual relationships normally
begin. Such a view of ticklishness, as a kind of modesty of the skin,
existing merely to be destroyed, need only be regarded as one of its
aspects. Ticklishness certainly arose from a non-sexual starting-point,
and may well have protective uses in the young animal.
The readiness with which tactile sensibility takes on a sexual character
and forms reflex channels of communication with the sexual sphere proper
is illustrated by the existence of certain secondary sexual foci only
inferior in sexual excitability to the genital region. We have seen that
the chief of these normal foci are situated in the orificial regions where
skin and mucous membrane meet, and that the contact of any two orificial
regions between two persons of different sex brought together under
favorable conditions is apt, when prolonged, to produce a very intense
degree of sexual erethism. This is a normal phenomenon in so far as it is
a part of tumescence, and not a method of obtaining detumescence.
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