Irrational beliefs have been related to a variety of psychological distresses, some of which are thought of more in relation to one sex than the other, i.e., depression, nonassertiveness, anger. However, Ellis did not assert that there were sex differences in irrational beliefs, and few researchers have examined the effect of sex-role socialization on irrational beliefs. The present study explored the effect of sex and sex-roles on irrational beliefs for a sample of 270 college students using the Irrational Beliefs Test and Bern's scale. While the study supports the belief that sex and sex-role are not unidimensional constructs, the data suggest that differences in sex-role socialization contribute to differences in adherence to irrational beliefs. It appears, however, that a feminine sex-role orientation is related to irrational beliefs. Although study is needed, clinicians are cautioned not to assume there are no sex or sex-role differences related to irrational thinking.