Masculinity (also called boyhood, manliness, machismo, or manhood) is a set of attributes, behaviors and roles generally associated with boys and men. Masculinity is socially constructed, but made up of both socially-defined and biologically-created factors, distinct from the definition of the male biological sex. Both males and females can exhibit masculine traits and behavior. Those exhibiting both masculine and feminine characteristics are considered androgynous, and feminist philosophers have argued that gender ambiguity may blur gender classification.