An interesting related study:
http//web.archive.org/...
Kinda tl;dr, so here's the gist:
"The current study is the largest to date to employ pedophilic stimuli and genital measures with men drawn from a community sample of volunteers. The current results suggest that sexual arousal to pedophilic stimuli occurs among a sizable minority of normal men who report no pedophilic behavior and is not necessarily associated with pedophilic behavior. Consistent with previous data (Barbaree & Marshall, 1989; Briere & Runtz, 1989; Fedora et al., 1992; Freund & Watson, 1991), 20 % of the current subjects self-reported pedophilic interest and 26.25 % exhibited penile arousal to pedophilic stimuli that equaled or exceeded arousal to adult stimuli."
Maybe there should be a Kinsey Scale for Pedo. Y'know, 0 for no interest whatsoever, 1-2 for sometimes having fantasies but no serious fixtation, and 6 if you use the Kids R Us catalogue as a faprag.