The effects of secondary stimulus characteristics on men's sexual arousal

The penile plethysmograph is believed by many researchers and clinicians to be the most valid and reliable instrument currently available for assessing male sexual arousal patterns. Stimuli used to elicit sexual arousal in research studies as well as in plethysmographic assessments, however, have varied considerably. We examined the effects of two stimulus characteristics that may greatly influence the measurement of male sexual arousal-the type of sexual behavior depicted and the presence of accompanying audio cues. The sexual arousal of 18 male college students was individually assessed via penile plethysmograph and self-report while they viewed 60-second erotic video clips. Each video clip depicted a single sexual behavior; half of the clips were presented with accompanying audio. Separate 2 (sound) x 6 (behavior) x 2 (session) repeated measures ANOVAs revealed significant main effects for sound and behavior for both the physiological and self-report data, as well as a significant sound x behavior interaction for the self-report data. The physiological data and self-report data were also highly correlated (r = .78). Results are discussed in the context of implications for male sexual arousal research and penile plethysmographic assessments.