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Measuring sexual arousal.

The impact of sexual offenses and abuse is incalculable, both on the victims themselves and the society responsible for protecting them. Identifying people who sexually offend against adults and children and preventing them from engaging in abusive behavior in the future requires valid and reliable methods that accurately identify the perpetrators' characteristics and measure treatment effectiveness. This article reviews the literature on penile plethysmography (PPG), a mechanism by which erectile response to deviant sexual stimuli can be measured.