Sexual assaults commonly involve alcohol use, but little is known about alcohol’s effects on many aspects of assaults and their aftermath. We investigated characteristics of victims, perpetrators, and assaults as a function of whether alcohol was involved in the assault, as well as differences in women’s post-assault experiences. Assaults prior to which only perpetrators were drinking differed not only from non-alcohol-related assaults, but also from those prior to which both perpetrators and victims were drinking. Understanding the effects of alcohol-related assaults is important for identifying victims who should be targeted for mental health and substance use interventions