Emerging evidence suggests large increases in criminal behavior and mortality coinciding with a young adult’s 21^st birthday, when alcohol consumption becomes legal.  The policy implications from these findings have focused on the need to reduce drinking among young people, potentially by enforcing stricter alcohol controls.  However, mortality and arrests are relatively infrequent outcomes and less is known about the intermediate and more prevalent consequences of legal access to alcohol at age 21.  This paper uses the Add Health data combined with a regression discontinuity approach to examine the effects of alcohol access on risky sexual behavior, drunk driving, violence, and other outcomes.  The results suggest relatively large effects that are concentrated entirely on men.  The sample also allows some suggestive policy implications on whether changing the minimum drinking age may reduce these consequences.