the other hand, the fondness for looking becomes a perversion (_a_) when
it limits itself entirely to the genitals; (_b_) when it becomes connected
with the overcoming of loathing (voyeurs and onlookers at the functions
of excretion); and (_c_) when instead of preparing for the normal sexual
aim it suppresses it. The latter, if I may draw conclusions from a
single analysis, is in a most pronounced way true of exhibitionists, who
expose their genitals so as in turn to bring to view the genitals of
others.

In the perversion which consists in striving to look and be looked at we
are confronted with a very remarkable character which will occupy us
even more intensively in the following aberration. The sexual aim is
here present in twofold formation, in an _active_ and a _passive_ form.

The force which is opposed to the peeping mania and through which it is
eventually abolished is _shame_ (like the former loathing).

*Sadism and Masochism.*--The desire to cause pain to the sexual object
and its opposite, the most frequent and most significant of all
perversions, was designated in its two forms by v. Krafft-Ebing as
sadism or the active form, and masochism or the passive form. Other
authors prefer the narrower term algolagnia which emphasizes the
pleasure in pain and cruelty, whereas the terms selected by v.
Krafft-Ebing place the pleasure secured in all kinds of humility and
submission in the foreground.

The roots of active algolagnia, sadism, can be readily demonstrable in
the normal. The sexuality of most men shows a taint of _aggression_, it
is a propensity to subdue, the biological significance of which lies in
the necessity of overcoming the resistance of the sexual object by