|(übersetzt):||Background: To examine whether sex offenders differ from other delinquents with respect to ADHD in childhood, impulsivity, and spatial abilities and speech lateralisation. Methods: Forty-three sex offenders were compared to 37 aggressive delinquents without sex offences and 44 non-aggressive delinquents without sex offences. In order to evaluate ADHD in childhood, a German translation of the Wender Utah Rating Scale, a retrospective questionnaire, was applied. Impulsivity was tested by means of the Delay of Gratification Task, spatial abilities by Vandenbergs Mental Rotation Test and speech lateralisation by means of dichotic listening. Results: All groups had a high incidence of ADHD in childhood. Significant differences were found in Delay of Gratification, with sex offenders showing the lowest performance. Differences in Mental Rotation Test nearly reach significance level. Conclusions: Regarding impulsivity the present findings underline the importance of impulse control as a behavioral treatment strategy. With regard to the differences in spatial abilities biological factors in the etiology of sexual delinquent behavior were assumed.