This investigation tested the hypothesis that friendliness from a member of the opposite sex might be misperceived as a sign of sexual interest. Previous research in the area of acquaintance and date rape suggests that males frequently misunderstand females' intentions. A laboratory experiment was conducted in which a male and female participated in a 5-minute conversation while a hidden male and female observed this interaction. The results indicate that there were sex differences in subjects' rating of the actors. Male actors and observers rated the female actor as being more promiscuous and seductive than female actors and observers rated her. Males were also more sexually attracted to the opposite-sex actor than females were. Furthermore, males also rated the male actor in a more sexualized fashion than females did. These results were interpreted as indicating that men are more likely to perceive the world in sexual terms and to make sexual judgments than women are. Males do seem to perceive friendliness from females as seduction, but this appears to be merely one manifestation of a broader male sexual orientation. The research described in this article grew out of the observation that females' friendly behavior is frequently misperceived by males as flirtation. Males tend to impute sexual interest to females when it is not intended. For example, one evening the author and a few of her female friends shared a table at a crowded campus bar with two male strangers. During one of the band's breaks, they struck up a friendly conversation with their male table companions. It was soon apparent that their friendliness had been misperceived by these men as a sexual invitation, and they finally had to excuse themselves from the table to avoid an awkward scene. What had been intended as platonic friendliness had been perceived as sexual interest. After discussions with several other women verified that this experience was not unique, the author began to consider several related, researchable issues. Do women similarly ...