" (G. Dearborn, "The Emotion of Joy,"
_Psychological Review Monograph Supplements_, vol. ii, No. 5, p.
62.) All these signs of joy appear to occur at some stage of the
process of sexual excitement.
In some monkeys it would seem that the muscular movement which in
man has become the smile is the characteristic facial expression
of sexual tumescence or courtship. Discussing the facial
expression of pleasure in children, S.S. Buckman has the
following remarks: "There is one point in such expression which
has not received due consideration, namely, the raising of lumps
of flesh each side of the nose as an indication of pleasure.
Accompanying this may be seen small furrows, both in children and
adults, running from the eyes somewhat obliquely towards the
nose. What these characters indicate may be learned from the male
mandril, whose face, particularly in the breeding season, shows
colored fleshy prominences each side of the nose, with
conspicuous furrows and ridges. In the male mandril these
characters have been developed because, being an unmistakable
sign of sexual ardor, they gave the female particular evidence of
sexual feelings.
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