Research has found that jurors are more likely to convict in stranger rape cases than in date rape cases. Often, even in cases in which sufficient physical evidence is present to support conviction, juries have reported being influenced by irrelevant factors related to the female victim such as whether she used birth control, engaged in non-marital sex, was perceived by jurors as sexually dressed, or had engaged in alcohol or other drug use. Researchers have noted that because date rape by definition occurs in the context of a dating relationship, jurors' propensity to discount the likelihood of rape having occurred based on date-like behaviors is problematic. A 1982 American study of assignment of responsibility for rape found respondents were more likely to assign greater responsibility to a rape victim if she was intoxicated at the time of the rape; however, when her assailant was intoxicated, respondents assigned him less responsibility.