"Francis Biddle's Sister: Pornography, Civil Rights, and Speech" (1984), p. 188
Feminism Unmodified: Discourses on Life and Law (1987)
Works

Only Words
Catharine A. MacKinnon
Toward a Feminist Theory of the State
Catharine A. MacKinnonFamous Catharine A. MacKinnon Quotes
"Postmodernism and Human Rights" (2000), p. 53
Are Women Human?: and Other International Dialogues (2006)
Sexuality, Pornography, and Method: "Pleasure under Patriarchy" (1989) Ethics, Vol. 99, No. 2 pp. 314-346
"Postmodernism and Human Rights" (2000), p. 54
Are Women Human?: and Other International Dialogues (2006)
"Francis Biddle's Sister: Pornography, Civil Rights, and Speech" (1984), p. 193
Feminism Unmodified: Discourses on Life and Law (1987)
Source: Reflections on Sex Equality under Law (1991) Yale Law Journal Vol.100 No. 5, p. 1212
Catharine A. MacKinnon Quotes about women
"Postmodernism and Human Rights" (2000), p. 62
Are Women Human?: and Other International Dialogues (2006)
Sexuality, Pornography, and Method: "Pleasure under Patriarchy" (1989) Ethics, Vol. 99, No. 2 pp. 314-346
These words were quoted by the conservative writer Cal Thomas as coming from Professing Feminism, a book by Daphne Patai and Noretta Koertge which he mistakenly ascribed to Catharine MacKinnon.
http://www.snopes.com/quotes/mackinno.htm
The actual passage in that book are the authors' characterization of MacKinnon's views rather than a direct quotation: And Andrea Dworkin and Catharine MacKinnon have long argued that in a patriarchal society all heterosexual intercourse is rape because women, as a group, are not in a strong enough social position to give meaningful consent—an assault on individual female autonomy uncannily reminiscent of old arguments for why women should not have political rights.
Instead MacKinnon argues that heterosexuality "institutionalizes male sexual dominance and female sexual submission" (1982) and that "Sexual access is regularly forced or pressured or routinized beyond denial" (1991).
Misattributed
Source: Feminism, Marxism, Method, and the State: An Agenda for Theory (1982) Signs Vol. 7, No.3, p. 533
"Introduction - The Art of the Impossible", p. 6
Feminism Unmodified: Discourses on Life and Law (1987)
Catharine A. MacKinnon Quotes about sex
"Sex and Violence: A Perspective" (1981), p. 88
Feminism Unmodified: Discourses on Life and Law (1987)
“Politically, I call it rape whenever a woman has sex and feels violated.”
"A Rally Against Rape" (1981), p. 82
Feminism Unmodified: Discourses on Life and Law (1987)
The allegation that Catharine MacKinnon equated sex with rape, or suggested that all sex is hostile, seems to have been first made in the October 1986 issue of Playboy. Catharine MacKinnon has denied ever saying anything of the kind. http://www.snopes.com/quotes/mackinno.htm
Instead MacKinnon asserts that rape and intercourse are "difficult to distinguish" (1983), and that "the major distinction between intercourse (normal) and rape (abnormal) is that the normal happens so often that one cannot get anyone to see anything wrong with it" (1989).
Misattributed
Sexuality, Pornography, and Method: "Pleasure under Patriarchy" (1989) Ethics, Vol. 99, No. 2 pp. 314-346
“Women are raped and coerced into sex.”
Source: Reflections on Sex Equality under Law (1991) Yale Law Journal Vol.100 No. 5, p. 1213
“Compare victims' reports of rape with women's reports of sex. They look a lot alike”
Sexuality, Pornography, and Method: "Pleasure under Patriarchy" (1989) Ethics, Vol. 99, No. 2 pp. 314-346
Catharine A. MacKinnon Quotes
"Francis Biddle's Sister: Pornography, Civil Rights, and Speech" (1984), p. 170
Feminism Unmodified: Discourses on Life and Law (1987)
Falsely attributed to Toward a Feminist Theory of the State (First Harvard University Press, 1989), p. 10 in "Waste, Fraud, and Abuse: Hearing Before the Committee on Ways and Means", US House of Representatives, , and spread on the Internet.
Probably based on the quotation opening Chapter 1: "Marxism and feminism are one, and that one is Marxism." — Heidi Hartmann and Amy Bridges, "The Unhappy Marriage of Marxism and Feminism"
Misattributed
Sexuality, Pornography, and Method: "Pleasure under Patriarchy" (1989) Ethics, Vol. 99, No. 2 pp. 314-346
Source: Only Words (1993), pp. 3-7
Source: Feminism, Marxism, Method, and the State: Toward Feminist Jurisprudence (1983) Signs Vol. 8 No. 4, p. 647
“In my opinion, no feminism worthy of the name is not methodologically post-marxist.”
"Desire and Power: A Feminist Perspective" (1983), p. 60
Feminism Unmodified: Discourses on Life and Law (1987)
Sexuality, Pornography, and Method: "Pleasure under Patriarchy" (1989) Ethics, Vol. 99, No. 2 pp. 314-346
“Can postmodernism hold the perpetrators of genocide accountable?”
"Postmodernism and Human Rights" (2000), p. 58
Are Women Human?: and Other International Dialogues (2006)
"The Prime of Miss Kitty MacKinnon" http://susiebright.blogs.com/Old_Static_Site_Files/Prime_Of_Kitty_MacKinnon.pdf, by Susie Bright, East Bay Express, October 1993.
Toward a Feminist Theory of the State (1991)