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The areas like penis and clitoris, scrotum and labia, vagina and anus, and mouse are the ones which are most often concerned in erotic stimulation and response. Other parts of the body may, however, be involved, and for some individuals these other parts may be as significant as any of the particular areas listed.

The lobe of the ear and the inner cavity leading from it are points of especial sensitivity for at least some persons. The ear lobes become engorged with blood during sexual arousal, and become increasingly sensitive at that time. An occasional female or male may reach orgasm as a result of the stimulation of the ears.
The erotic sensitivity of the ear is quite common knowledge. In the literature see: Van de Velde 1930:45. Havelock Ellis 1936(11,1):143. Stone and Stone 1937:221; 1952:182. Beach 1947b :246.

The nape of the neck, the throat, the soles of the feet, the palms of the hand, the armpits, the tips of the fingers, the toes, the navel area, the midline at the lower end of the back, the whole abdominal area, the whole pubic area, the groin, and still other parts have been recognized as areas which may be erotically sensitive under tactile stimulation. Even non-sensitive, non-living structures like teeth and hair may sometimes become sources of erotic stimulation, because movements of those structures stimulate the sensitive nerves that lie at their bases. There are females in our histories who have been brought to orgasm by having their eyebrows stroked, or by having the hairs on some other part of their bodies gently blown, or by having pressure applied on the teeth alone. This may be a factor in the biting which often accompanies sexual activities. Such stimuli are most effective when there is some accompanying and significant psychologic stimulation. Acting alone, these unusual sorts of stimuli would rarely be sufficient to effect any considerable arousal. Acting in conjunction with other physical and psychologic stimuli, they may, on occasion, provide the additional impetus which is necessary to carry the individual on to orgasm.

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