It has not seriously been brought
forward since.
When erection is completed in both the man and the woman the conditions
necessary for conjugation have at last been fulfilled. In all animals,
even those most nearly allied to man, coitus is effected by the male
approaching the female posteriorly. In man the normal method of male
approach is anteriorly, face to face. Leonardo da Vinci, in a well-known
drawing representing a sagittal section of a man and a woman connected in
this position of so-called Venus obversa; has shown how well adapted the
position is to the normal position of the organs in the human
species.[105]
Among monkeys, it is stated, congress is sometimes performed when
the female is on all fours; at other times the male brings the
female between his thighs when he is sitting, holding her with
his forepaws. Froriep informed Lawrence that the male sometimes
supported his feet on the female's calves. (Sir W. Lawrence,
_Lectures on Physiology_, 1823, p. 186.) A summary of the methods
of congress practiced by the various animals below mammals will
be found in the article "Copulation" by H. de Varigny in Richet's
_Dictionnaire de Physiologie_, vol.
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