Study published in International Journal of Men's Health, Volume 10, Number 2 / July 2011. DOI10.3149/jmh.1002.184. In the first study of its kind,  Dan Bollinger and Robert S. Van Howe, M.D., M.S., FAAP, look at the link between circumcision and the personality trait disorder alexithymia. The study found that circumcised men are 60% more likely to suffer from alexithymia.

Alexithymia is the inability to process emotions. People suffering from alexithymia have difficulty identifying and expressing their feelings. The disorder translates into not being able to imagine what others are feeling and leading to an inability to respond to others’ needs. If acquired at an early age, the disorder might limit access to language and interfere with the socialization process that begins early in life. Moderate to high alexithymia can interfere with personal relationships and hinder therapy. Impulsive behavior is a key symptom of alexithymia, and impulsivity is a precursor to violence.