Teens and young adults face many pressures and decisions involving alcohol, drugs, and sexual activity decisions that often occur simultaneously. Almost one quarter of sexually active young people aged 15-24 report having sex without a condom because they were drinking or using drugs at the time. These findings are from a new national survey conducted by the Kaiser Family Foundation and released at a conference, Dangerous Liaisons: Substance Abuse and Sexual Behavior, sponsored by the National Center on Addiction and Substance Abuse (CASA) at Columbia University.