Penile pletysmography measures of these men in response either to visual stimuli or to erotic narrative stories including child objects. Penile pletysmography seems to be quite intrusive assessment method, so viewing time might be a good alternative if accuracy proven.
The present study aimed to determine how viewing time results correlate with penile response in reaction to naked male/female photos stimuli in 6 stages of sexual development. Participants were 30 paedophiles and 30 heterosexul gynephile men, who were tested to the set of 38 stimuli for PPG and VT.