The degree of pigmentation is clearly correlated with sexual vigor. "In
general," Heusinger laid down, in 1823, "the quantity of pigment is
proportional to the functional effectiveness of the genital organs." This
connection is so profound that it may be traced very widely throughout the
organic world.
The connection between pigmentation and sexual activity is very ancient.
Even leaving out of account the wedding apparel of animals, nearly always
gorgeous in scales and plumage and hair, the sexual orifice shows a more
or less marked tendency to pigmentation during the breeding season from
fishes upward, while in mammals the darker pigmentation of this region is
a constant phenomenon in sexually mature individuals.[159]
In the human species both the negative standard of castration and the
positive standard of puberty alike indicate a correlation of this kind.
Those individuals in whom puberty never fully develops and who are
consequently said to be affected by infantilism, reveal a relative absence
of pigment in the sexual centers which are normally pigmented to a high
degree.[160] Among those Asiatic races who extirpate the ovaries in young
girls the skin remains white in the perineum, round the anus, and in the
armpits.
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