Three studies were conducted to develop and validate a measure of sexual harassment proclivities in males. Previous studies of sexual harassment were reviewed and a gap in the current knowledge of the psychological characteristics of sexual harassers was revealed. A possible technique for studying sexual harassment proclivities was suggested by recent research on rape proclivities. Two initial studies using this technique found (1) that the likelihood of sexually harassing can be reliably measured and 2) that this measure correlated with related attitude and belief measures. The third study demonstrated that the likelihood of sexual harassment measure can predict sexual behaviors in a laboratory setting.