Although often ignored in discussions of masculinity, women can also express masculine traits and behaviors. In Western culture, female masculinity has been codified into identities such as "tomboy" and "butch". Although female masculinity is often associated with lesbianism, expressing masculinity is not necessarily related to a woman's sexuality. In feminist philosophy, female masculinity is often characterized as a type of gender performance which challenges traditional masculinity and male dominance. Zachary A. Kramer argues that the discussion of masculinity should be opened up "to include constructions of masculinity that uniquely affect women." Masculine women are often subject to social stigma and harassment, although the influence of the feminist movement has led to greater acceptance of women expressing masculinity in recent decades.