the obvious response involved sexual behaviour in males penile erection. use of volume (or circumference) change during penile erection convenient measure of sexual arousal first developed kurt freund. measurement of blood flow male genitals known penile plethysmography. commonly measured using strain gauge, simple mercury strain gauge encompassed in ring of rubber. ring surrounds penis, not constrict or cause discomfort. measure has been found reliable , valid measurement of male arousal. more recently, thermography has been developed measure physiological measurements of sexual arousal. studies have found temperature change specific genitals during sexual arousal, supports validity of measure.
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