With regard

to large-sized vivipara, the hind only very rarely
sustains the mounting of the stag to the full conclusion of the
operation, and the same is the case with the cow as regards the
bull, owing to the rigidity of the penis of the bull. In point of
fact, the females of these animals elicit the sperm of the male in the
act of withdrawing from underneath him; and, by the way, this
phenomenon has been observed in the case of the stag and hind,
domesticated, of course. Covering with the wolf is the same as with
the dog. Cats do not copulate with a rearward presentment on the
part of the female, but the male stands erect and the female puts
herself underneath him; and, by the way, the female cat is
peculiarly lecherous, and wheedles the male on to sexual commerce, and
caterwauls during the operation.