This report represents the second in a series intended to summarize the empirical research findings and major theoretical approaches relating to the issues of drug use and abuse. This volume reviews some of the major research findings which explore the relationship between nonmedical drug use and sexual behavior. The research is summarized and classified according to the type of drug use studied: multi-drug, marijuana, amphetamines, LSD, heroin and methadone. The summaries are formulated and detailed to provide the reader with the purpose, methodology, findings and conclusions of each study reviewed. (Author/SJL)