Many societies assign sharply distinguished roles to men and women. Personality differences, as well as physical differences, between men and women are used to justify these different sex roles, and women are seen as more emotionally and interpersonally sensitive than men, while men are said to be more competent, achievement oriented, and assertive than women. A widely held view is that not only do men and women differ but that possession of "masculine" characteristics precludes possession of "feminine" characteristics. This bipolar conception has led to the definition of masculinity and femininity as opposites. Acceptance of this idea has caused social scientists and laypersons to consider men and women who possess cross-sex personality characteristics as less emotionally healthy and socially adjusted than those with sex-appropriate traits.
