significance of the factor of sexual overestimation can be best studied
in the man, in whom alone the sexual life is accessible to
investigation, whereas in the woman it is veiled in impenetrable
darkness, partly in consequence of cultural stunting and partly on
account of the conventional reticence and dishonesty of women.

The employment of the mouth as a sexual organ is considered as a
perversion if the lips (tongue) of the one are brought into contact with
the genitals of the other, but not when the mucous membrane of the lips
of both touch each other. In the latter exception we find the connection
with the normal. He who abhors the former as perversions, though these
since antiquity have been common practices among mankind, yields to a
distinct _feeling of loathing_ which protects him from adopting such
sexual aims. The limit of such loathing is frequently purely
conventional; he who kisses fervently the lips of a pretty girl will
perhaps be able to use her tooth brush only with a sense of loathing,
though there is no reason to assume that his own oral cavity for which
he entertains no loathing is cleaner than that of the girl. Our
attention is here called to the factor of loathing which stands in the
way of the libidinous overestimation of the sexual aim, but which may
in turn be vanquished by the libido. In the loathing we may observe one
of the forces which have brought about the restrictions of the sexual
aim. As a rule these forces halt at the genitals; there is, however, no
doubt that even the genitals of the other sex themselves may be an
object of loathing. Such behavior is characteristic of all hysterics,
especially women. The force of the sexual impulse prefers to occupy
itself with the overcoming of this loathing (see below).

*Sexual Utilization of the Anal Opening.*--It is even more obvious than
in the former case that it is the loathing which stamps as a perversion