There are also the following verses on the subject.
"The male servants of some men carry on the mouth congress with their
masters. It is also practised by some citizens, who know each other
well, among themselves. Some women of the harem, when they are amorous,
do the acts of the mouth on the yonis of one another, and some men do
the same thing with women. The way of doing this (_i.e._, of kissing the
yoni) should be known from kissing the mouth. When a man and woman lie
down in an inverted order, _i.e._, with the head of the one towards the
feet of the other and carry on this congress, it is called the "congress
of a crow."
For the sake of such things courtezans abandon men possessed of good
qualities, liberal and clever, and become attached to low persons, such
as slaves and elephant drivers. The Auparishtaka, or mouth congress,
should never be done by a learned Brahman, by a minister that carries on
the business of a state, or by a man of good reputation, because though
the practice is allowed by the Shastras, there is no reason why it
should be carried on, and need only be practised in particular cases. As
for instance, the taste, and the strength, and the digestive qualities
of the flesh of dogs are mentioned in works on medicine, but it does not
therefore follow that it should be eaten by the wise. In the same way
there are some men, some places and some times, with respect to which
these practices can be made use of. A man should therefore pay regard to
the place, to the time, and to the practice which is to be carried out,
as also as to whether it is agreeable to his nature and to himself, and
then he may or may not practise these things according to circumstances.
But after all, these things being done secretly, and the mind of the man
being fickle, how can it be known what any person will do at any
particular time and for any particular purpose.
FOOTNOTE:
[Footnote 39: This practice appears to have been prevalent in some parts
of India from a very ancient time. The "Shushruta," a work on medicine
some two thousand years old, describes the wounding of the lingam with
the teeth as one of the causes of a disease treated upon in that work.
Traces of the practice are found as far back as the eighth century, for
various kinds of the Auparishtaka are represented in the sculptures of
many Shaiva temples at Bhuvaneshwara, near Cuttack, in Orissa, and which
were built about that period. From these sculptures being found in such
places, it would seem that this practice was popular in that part of the
country at that time. It does not seem to be so prevalent now in
Hindustan, its place perhaps is filled up by the practice of sodomy,
introduced since the Mahomedan period.]