During this period, the movement produced "a prodigious output of leaflets, pamphlets, journals, magazine articles, newspaper and radio and TV interviews". Many important feminist works, such as Koedt's essay The Myth of the Vaginal Orgasm (1970) and Kate Millet's book Sexual Politics (1970), emerged during this time and in this milieu. Ideology emerges and diverges At the beginning of this period, "heterosexuality was more or less an unchallenged assumption". Among radical feminists, it was widely held that, thus far, the sexual freedoms gained in the sexual revolution of the 1960s, in particular, the decreasing emphasis on monogamy, had been largely gained by men at women's expense. This assumption of heterosexuality would soon be challenged by the rise of political lesbianism, closely associated with Atkinson and The Feminists. Redstockings and The Feminists were both radical feminist organizations, but held rather distinct views. Most members of Redstockings held to a materialist and anti-psychologistic view. They viewed men's oppression of women as ongoing and deliberate, holding individual men responsible for this oppression, viewing institutions and systems (including the family) as mere vehicles of conscious male intent, and rejecting psychologistic explanations of female submissiveness as blaming women for collaboration in their own oppression. They held to a view—which Willis would later describe as "neo-Maoist"—that it would be possible to unite all or virtually all women, as a class, to confront this oppression by personally confronting men. The Feminists held a more idealistic, psychologistic, and utopian philosophy, with a greater emphasis on "sex roles", seeing sexism as rooted in "complementary patterns of male and female behavior". They placed more emphasis on institutions, seeing marriage, family, prostitution, and heterosexuality as all existing to perpetuate the "sex-role system". They saw all of these as institutions to be destroyed. Within the group, there were further disagreements, such as Koedt's viewing the institution of "normal" sexual intercourse as being focused mainly on male sexual or erotic pleasure, while Atkinson viewed it mainly in terms of reproduction. In contrast to the Redstockings, The Feminists generally considered genitally focused sexuality to be inherently male. Ellen Willis, the Redstockings co-founder, would later write that insofar as the Redstockings considered abandoning heterosexual activity, they saw it as a "bitter price" they "might have to pay for [their] militance", whereas The Feminists embraced separatist feminism as a strategy. The New York Radical Feminists (NYRF) took a more psychologistic (and even biologically determinist) line. They