Criminal statistics consistently report a far higher prevalence of offending amongst males than females. Again, this varies by type of offence, so whilst the vast majority of burglaries, robberies and violent crimes are committed by men, gender differences are less marked for theft and fraud. There are a number of possible reasons for this. One is that gender differences in offending reflect constitutional differences between males and females. This is more likely to be the case for personal and violent crimes where gender differences are most marked.