Objective: The authors investigated the magnitude and cultural context of legal-age university students' provision of alcohol to underage students and how such alcohol provision might be deterred. Participants: 130 legal-age students at a midwestern university in the United States were randomly selected. Methods: The authors assessed 16 focus groups and a thematic analysis. Results: Most participants reported frequent alcohol provision. Most denied moral responsibility for any negative consequences that recipients might suffer. Small numbers of participants, chiefly women, would decrease alcohol provision after education on the sexual risks to underage females. Larger numbers would decrease provision in response to consistent law enforcement, severe legal and disciplinary penalties, and education on severe penalties. Conclusions: Legal-age students' provision of alcohol to underage students is an integral part of college students' drinking culture. As a deterrent, an enforcement-based campaign may be more effective than an educational campaign on the possible negative consequences of alcohol for underage students.