“…Several published reports discuss the reliability and validity of PPG assessments (Fernandez, ; Marshall, ; McPhail et al, ; Merdian & Jones, ; Murphy et al, ). Concerning the utility of PPG, Marshall (), notes that, “Despite these reservations, phallometry remains the best approach to establishing a sex offender's sexual interest and, so long as the resultant data is interpreted [by experts and] with caution, they can usefully contribute to risk assessment and to defining targets for treatment” (p. 3).…”