Alcohol's psychological, cognitive, and motor effects contribute to rape. Based on theory and past research, we hypothesized that there would be a curvilinear relationship between the quantity of alcohol consumed by perpetrators and how aggressively they behaved. Moderate levels of intoxication encourage aggressiveness; however, extreme levels severely inhibit cognitive and motor capacity. We also hypothesized that victims' alcohol consumption would have a curvilinear relationship to their resistance. These hypotheses were examined with data from 132 college women who had been the victims of attempted or completed rape. Although there was a curvilinear result for perpetrators, the slope of the curve suggested that aggressiveness was worst when no alcohol or the highest levels of alcohol were consumed. There was a negative linear relationship between victims' alcohol consumption and resistance. Difficulties associated with accurately assessing degree of intoxication from survey data are discussed and suggestions are made for improving alcohol measurement in rape research.