Yohimbin, an alkaloid derived from the West African Yohimbehe
tree, has obtained considerable repute during recent years in the
treatment of impotence; in some cases (see, e.g., Toff's results,
summarized in _British Medical Journal_, February 18, 1905) it
has produced good results, apparently by increasing the blood
supply to the sexual organs, but has not been successful in all
cases or in all hands. It must always be remembered that in cases
of psychical impotence suggestion necessarily exerts a beneficial
influence, and this may work through any drug or merely with the
aid of bread pills. All exercise, often even walking, may be a
sexual stimulant, and it is scarcely necessary to add that
powerful stimulation of the skin in the sexual sphere, and more
especially of the nates, is often a more effective aphrodisiac
than any drug, whether the irritation is purely mechanical, as by
flogging, or mechanico-chemical, as by urtication or the
application of nettles. Among the Malays (with whom both men and
women often use a variety of plants as aphrodisiacs, according to
Vaughan Stevens) Breitenstein states (_21 Jahre in India_, Theil
I, p.
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