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With the advent of the acquired immunodeficiency syndrome (AIDS) epidemic, research on the relationship of drinking to sexual activity takes on increased importance. Although several studies have investigated the characteristics of sexual encounters that do and do not involve alcohol, few studies have examined drinking incidents that may or may not result in sexual activity. Respondents in three surveys were asked about the circumstances of a recent heavy drinking occasion. Approximately one third of the respondents reported having sex during this maximum consumption episode, and the likelihood of having sex was a significant positive linear function of the amount of alcohol consumed. Respondents who drank more heavily in the episode were slightly more likely to have sex with a new or casual partner.