ncordance supposes a
resemblance between the mouth and the sexual organs of a woman, between
coitus and the ingestion of food, and between foods which do not require
mastication and the spermatic ejaculation; these representations find
expression in the popular name _papo_ given to women's genital organs.
'Papo' is the crop of birds, and is derived from 'papar' (Latin,
_papare_), to eat soft food such as we call pap. With this representation
of infantile food is connected the term _leche_ [milk] as applied to the
ejaculated genital fluid." Cleland, it may be added, in the most
remarkable of English erotic novels, _The Memoirs of Fanny Hill_, refers
to "the compressive exsuction with which the sensitive mechanism of that
part [the vagina] thirstily draws and drains the nipple of Love," and
proceeds to compare it to the action of the child at the breast. It
appears that, in some parts of the animal world at least, there is a real
analogy of formation between the oral and vaginal ends of the trunk. This
is notably the case in some insects, and the point has been elaborately
discussed by Walter Wesche, "The Genitalia of Both the Sexes in Diptera,
and their Relation to the Armature of the Mouth," _Transactions of the
Linnean Society_, second series, vol. ix, Zooelogy, 1906.

[18] Naecke now expresses himself very dubiously on the point; see, e.g.,
_Archiv fuer Kriminal-Anthropologie_, 1905, p. 186.

[19] _Untersuchungen ueber die Libido Sexualis_, Berlin, 1897-98.

[20] Moll adopts the term "impulse of detumescence" (_Detumescenztrieb_)
instead of "impulse of ejaculation," because in women there is either no
ejaculation or it cannot be regarded as essential.

[21] I quote from the second edition, as issued in 1881.

[22] This is the theory which by many has alone been seen in Darwin's
_Descent of Man_. Thus even his friend Wallace states unconditionally
(_Tropical Nature_, p. 193) that Darwin accepted a "voluntary or conscious
sexual selection," and seems to repeat the same statement in _Darwinism_
(1889), p. 283. Lloyd Morgan, in his discussion of the pairing instinct in
_Habit and Instinct_ (1896), seems also only to see this side of Darwin's
statement.

[23] In his _Variation of Animals and Plants under Domestication_, Darwin
was puzzled by the fact that, in captivity, animals often copulate without
conceiving and failed to connect that fact with the processes behind his
own theory of sexual selection.

[24] Beauni