Lesbian feminism is a cultural movement and critical perspective that encourages women to focus their efforts, attentions, relationships, and activities towards their fellow women rather than men, and often advocates lesbianism as the logical result of feminism. Lesbian feminism was most influential in the 1970s and early 1980s, primarily in North America and Western Europe, but began in the late 1960s and arose out of dissatisfaction with the New Left, the Campaign for Homosexual Equality, sexism within the gay liberation movement, and homophobia within popular women's movements at the time. Many of the supporters of Lesbianism were actually women involved in gay liberation who were tired of the sexism and centering of gay men within the community and lesbian women in the mainstream women's movement who were tired of the homophobia involved in it. Some key thinkers and activists include Charlotte Bunch, Rita Mae Brown, Adrienne Rich, Audre Lorde, Marilyn Frye, Mary Daly, Sheila Jeffreys, Barbara Smith, Pat Parker, Margaret Sloan-Hunter, Cheryl Clarke, Gloria E. Anzaldúa, Cherríe Moraga, Monique Wittig, and Sara Ahmed (although the last two are more commonly associated with the emergence of queer theory). As stated by lesbian feminist Sheila Jeffreys, "Lesbian feminism emerged as a result of two developments: lesbians within the Women's liberation movement began to create a new, distinctively feminist lesbian politics, and lesbians in the Gay Liberation Front left to join up with their sisters". According to Judy Rebick, a leading Canadian journalist and feminist activist, lesbians were and always have been "the heart of the women's movement", while their issues were "invisible" in the same movement. Lesbian feminism of color emerged as a response to lesbian feminism thought that failed to incorporate the issues of class and race as sources of oppression along with heterosexuality. Key ideas Lesbian feminism, much like feminism, lesbian and gay studies, and queer theory, is characterized by the ideas of contestation and revision. At the same time, one of the key themes of lesbian feminism is the analysis of heterosexuality as an institution. Lesbian feminist texts work to denaturalise heterosexuality and, based on this denaturalization, to explore heterosexuality's "roots" in institutions such as patriarchy, capitalism, and colonialism. Additionally, lesbian feminism advocates lesbianism as a rational result of alienation and dissatisfaction with these institutions. Sheila Jeffreys defines lesbian feminism as having seven key themes: An emphasis on women's love for one another Separatist organizations Community and ideas Idea