"reflective, sensitive to the feelings of others, averse to risk, abstain from alcohol or drug use, and endorse attitudes and beliefs supportive of norms and the laws" may be unlikely to abuse children. A 2015 study indicates that pedophiles who molested children are neurologically distinct from non-offending pedophiles. The pedophilic molesters had neurological deficits suggestive of disruptions in inhibitory regions of the brain, while non-offending pedophiles had no such deficits. According to Abel, Mittleman, and Becker (1985) and Ward et al. (1995), there are generally large distinctions between the characteristics of pedophilic and non-pedophilic molesters. They state that non-pedophilic offenders tend to offend at times of stress; have a later onset of offending; and have fewer, often familial, victims, while pedophilic offenders often start offending at an early age; often have a larger number of victims who are frequently extrafamilial; are more inwardly driven to offend; and have values or beliefs that strongly support an offense lifestyle. One study found that pedophilic molesters had a median of 1.3 victims for those with girl victims and 4.4 for those with boy victims. Child molesters, pedophilic or not, employ a variety of methods to gain sexual access to children. Some groom their victims into compliance with attention and gifts, while others use threats, alcohol or drugs, or physical force. History Pedophilia is believed to have occurred in humans throughout history, but was not formally named, defined or studied until the late 19th century. The term paedophilia erotica was coined in an 1896 article by the Viennese psychiatrist Richard von Krafft-Ebing but does not enter the author's Psychopathia Sexualis until the 10th German edition. A number of authors anticipated Krafft-Ebing's diagnostic gesture. In Psychopathia Sexualis, the term appears in a section titled "Violation of Individuals Under the Age of Fourteen", which focuses on the forensic psychiatry aspect of child sexual offenders in general. Krafft-Ebing describes several typologies of offender, dividing them into psychopathological and non-psychopathological origins, and hypothesizes several apparent causal factors that may lead to the sexual abuse of children. Krafft-Ebing mentioned paedophilia erotica in a typology of "psycho-sexual perversion". He wrote that he had only encountered it four times in his career and gave brief descriptions of each case, listing three common traits: The individual is tainted [by heredity] (hereditär belastete) The subject's primary attraction is to children, rather than adults. The acts committed by the subject are typically not intercourse,