Thus the uterus of various species of _semnopithecus_
seems to show a noteworthy correspondence with the same organ in
woman.[76] The somewhat less degree of sexual differentiation is well
shown in the gorilla; in the male the external organs are in the passive
state covered by the wrinkled skin of the abdomen, while in the female,
on the contrary, they are very apparent, and in sexual excitement the
large clitoris and nymphae become markedly prominent. The penis of the
gorilla, however, more nearly resembles that of man, according to
Hartmann, than does that of the other anthropoid apes, which diverge from
the human type in this respect more than do the cynocephalic apes and some
species of baboon.
From the psychological point of view we are less interested in the
internal sexual organs, which are most fundamentally concerned with the
production and reception of the sexual elements, than with the more
external parts of the genital apparatus which serve as the instruments of
sexual excitation, and the channels for the intromission and passage of
the seminal fluid. It is these only which can play any part at all in
sexual selection; they are the only part of the sexual apparatus which can
enter into the formation of either normal or abnormal erotic conceptions;
they are the organs most prominently concerned with detumescence; they
alone enter normally into the conscious process of sex at any time.
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