Fazio, Rachel L., Dyshniku Fiona, Murray Michelle E., Lykins Amy D., & Cantor James M.; Minor Physical Anomalies as a Window into the Prenatal Origins of Pedophilia; Archives of Sexual Behavior; 2015(564), , Jun 10 2015
Evidence is steadily accumulating to support a neurodevelopmental basis for pedophilia. This includes increased incidence of non-right-handedness, which is a result primarily of prenatal neural development and solidified very early in life. Minor physical anomalies (MPAs; superficial deviations from typical morphological development, such as un-detached earlobes) also develop only prenatally, suggesting them as another potential marker of atypical physiological development during the prenatal period among pedophiles.

This study administered the Waldrop Physical Anomaly Scale to assess the prevalence of MPAs in a clinical sample of men referred for assessment following a sexual assault, or another illegal or clinically significant sexual behavior.

Significant associations emerged between MPA indices and indicators of pedophilia, including penile responses to depictions of children, number of child victims, and possession of child pornography. Moreover, greater sexual attraction to children was associated with an elevated craniofacial-to-peripheral anomalies ratio. The overall sample demonstrated a greater number of MPAs relative to prior samples of individuals with schizophrenia as well as to healthy controls.
Blanchard, Ray, Lykins Amy D., Wherrett Diane, Kuban Michael E., Cantor James M., Blak Thomas, et al.; Pedophilia, hebephilia, and the DSM-V; Archives of Sexual Behavior; 38, 335-350
The present study sought to validate the concept of hebephilia by examining the agreement between self-reported sexual interests and objectively recorded penile responses in the laboratory.
These results indicated that hebephilia exists as a discriminable erotic age-preference.
The authors recommend various ways in which the DSM might be altered to accommodate the present findings. One possibility would be to replace the diagnosis of Pedophilia with Pedo-hebephilia [...].