Abstract
Testosterone-lowering agents, serotonin re-uptake inhibitors, surgical castration, and stereotaxic neurosurgery have been used to reduce libido, deviant sexual arousal and fantasy, and the frequency of deviant sexual behavior in pedophiles. Though classified as a psychosexual disorder, there are strong obsessionand compulsioncomponents that make incorporation of cognitive behavioral skills difficult. Medications that lower sex drive are thought to enhance voluntary control. Leuprolide acetate (LA) has been used for this type of therapy. It is one of several synthesized agonist analogs of luteinizing hormone-releasing hormone (LHRH, aka GnRH), the hypothalamic factor that stimulates gonadotropin release from the pituitary and produces a paradoxical effect on the pituitary,with initial stimulationof the release of luteinizinghormone (LH) and folliclestimulating hormone (FSH) followed by inhibition after repeated administration. LA causes a reduction in testosterone release (a decrease in testicular steroidogenesis) that is probably secondary to a primary reduction in LH levels. With LA, testosterone levels are lower than those attained with other medications. Pedophiles were studied in a placebo-controlled, blinded, multidisciplinary study that detailed the objective effects of this drug onmeasurable aspects of the arousal response. One year of therapy on LA was followed by one year on a saline placebo. Testosterone levels were correlated with outcomes from polygraph testing, plethysmography (PPG) with audio and visual stimuli, viewing time for visual stimuli, and self report of urges and masturbatory frequency toward children. Testosterone levels on LA decreased to less than 50 ng/dl with sustained suppression of testosterone, FSH, and LH for the duration of treatment. On placebo, testosterone levels rose to approach baseline. The study subjects reported decreased sex drive, decreased pedophilic sexual urges, and decreased masturbation frequency when on LA.Modified visual reaction time and PPG indicated no consistent change in pedophilic interest preferences with LA. PPG verified self-reported claims of significant reductions in the magnitude of sexual arousal. LA reduced pedophilic fantasies, urges, and masturbation on self report with polygraph agreement.
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Schober, J. (2008). Aspects of Behavior in Pedophillic Sex Offenders Treated with Leuprolide Acetate. In: Pfaff, D., Kordon, C., Chanson, P., Christen, Y. (eds) Hormones and Social Behaviour. Research and Perspectives in Endocrine Interactions. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-79288-8_11
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