Sex-positive feminism, also known as pro-sex feminism, sex-radical feminism, or sexually liberal feminism is a movement that began in the early 1980s that centers on the idea that sexual freedom is an essential component of women's freedom. Some became involved in the sex-positive feminist movement in response to efforts by anti-pornography feminists to put pornography at the center of a feminist explanation of women's oppression (McElroy, 1995). This period of intense debate and acrimony between sex-positive and anti-pornography feminists during the early 1980s is often referred to as the feminist sex wars. Other less academic sex-positive feminists became involved not in opposition to other feminists but in direct response to what they saw as patriarchal control of sexuality. Women who have advocated sex-positive feminism include Kathy Acker, Megan Andelloux, Susie Bright, Rachel Kramer Bussel, Diana Cage, Avedon Carol, Patrick Califia, Betty Dodson, Nancy Friday, Nina Hartley, Josephine Ho, Amber L. Hollibaugh, Brenda Howard, Wendy McElroy, Inga Muscio, Joan Nestle, Carol Queen, Candida Royalle, Gayle Rubin, Annie Sprinkle, Tristan Taormino, Ellen Willis, Lorde, and Laci Green.