the cultural philosophy that understands sexuality as a potentially positive force in one’s life, and it can, of course, be contrasted with sex-negativity, which sees sex as problematic, disruptive, and dangerous. Sex-positivity allows for and in fact celebrates sexual diversity, differing desires and relationships structures, and individual choices based on consent. History Main articles: 1960s counterculture, Free Love and Sexual revolution In general use, the term sexual liberation is used to describe a socio-political movement, witnessed from the 1960s into the 1970s. However, the term has been used at least since the late 1920s and is often attributed as being influenced by Freud's writing on sexual liberation and psychosexual issues, as well as Wilhelm Reich, who originally coined the term. During the 1960s, a shift in the ways people thought about sexuality began to take place, heralding a period of de-conditioning in some circles away from old world antecedents, and developing new codes of sexual behavior, many of which have since been integrated into the mainstream. The 1960s also heralded a new culture of "free love" with millions of young people embracing the hippie ethos and preaching the power of love and the beauty of sex as a natural part of ordinary life. Hippies believed that sex and sexuality were natural biological phenomena that should be neither denied nor repressed. Changes in attitudes reflected a perception that traditional views on sexuality were both hypocritical and male-chauvinistic. Sexual liberalization heralded a new ethos in experimenting with open sex in and outside of marriage, contraception and the pill, public nudity, gay liberation, legalized abortion, interracial marriage, a return to natural childbirth, women's rights, and feminism. Historian David Allyn argues that the sexual revolution was a time of "coming-out": about premarital sex, masturbation, erotic fantasies, pornography use, and sexuality. The term sex-positive first came into use in the United States in the late 1990s with the founding of the Center for Sex and Culture in San Francisco, California, and The Center for Sex Positive Culture in Seattle, Washington. In 2009, Sex Positive World began in Portland, Oregon. As of 2019, there are more than sixteen chapters of the nonprofit, in five countries. Sex-positive feminism 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. Some became involved in the sex-positive feminist movement in response to efforts by anti-pornography feminists, such as