Hence no one goes bald before the time of sexual intercourse, and at
that time it is in those naturally inclined to such intercourse that
baldness appears, for the brain is naturally the coldest part of the
body and sexual intercourse makes men cold, being a loss of pure
natural heat. Thus we should expect the brain to feel the effect of it
first, for a little cause turns the scale where the thing concerned is
weak and in poor condition. Thus if we reckon up these points, that
the brain itself has but little heat, and further that the skin
round it must needs have still less, and again that the hair must have
still less than the skin inasmuch as it is furthest removed from the
brain, we should reasonably expect baldness to come about this age
upon those who have much semen. And it is for the same reason that the
front part of the head alone goes bald in man and that he is the
only animal to do so; the front part goes bald because the brain is
there, and man is the only animal to go bald because his brain is much
the largest and the moistest. Women do not go bald because their
nature is like that of children, both alike being incapable of
producing seminal secretion. Eunuchs do not become bald, because
they change into the female condition. And as to the hair that comes
later in life, eunuchs either do not grow it at all, or lose it if
they happen to have it, with the exception of the pubic hair; for
women also grow that though they have not the other, and this
mutilation is a change from the male to the female condition.
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