According to a new study published in the journal Social Psychiatry and Psychiatric Epidemiology, adult men who live at home with their parents are more likely to use drugs, get in fights, and engage in risky sexual behavior than their independent peers. The authors of the study suggest that a lack of responsibilities for living expenses or a young family is part of the problem:
Violence outside of the home and involving strangers can be construed as one among a series of hedonistic and negative social behaviours – including hazardous drinking, drug misuse, sexual risk-taking and non-violent anti-social behaviour – exhibited by a subgroup without responsibilities of providing their accommodation, supporting dependent children, or ameliorating effects on their behaviour of living with a female partner.
You can read an article that provides more information on this study here.