“I had the endurance but not the brute strength that must be coupled with it. No woman has this combination. That's why I say none of my sex will ever accomplish that particular stunt.”

Playboy interview, May 1971

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

John Banville: Using words to paint pictures of "magical" Prague (2006)

Source: The End of the Affair

theguardian.com http://www.theguardian.com/artanddesign/2010/jun/29/norman-foster-interview.

Source: Orlando: A Biography (1928), Ch. 3
Context: The sound of the trumpets died away and Orlando stood stark naked. No human being, since the world began, has ever looked more ravishing. His form combined in one the strength of a man and a woman's grace.

The Task of Social Hygiene, ch. 3 HTTP://BOOKS.GOOGLE.COM/books?id=nAoAAAAAYAAJ&q=%22charm+which+means+the+power+to+effect+work+without+employing+brute+force+is+indispensable+to+women+charm+is+a+woman%27s+strength+just+as+strength+is+a+man%27s+charm%22&pg=PA81#v=onepage

The Soul of a Butterfly, 2004
Variant: All through my life I have been tested. My will has been tested, my courage has been tested, my strength has been tested. Now my patience and endurance are being tested.
Source: The Soul of a Butterfly: Reflections on Life's Journey

As quoted in Life on the Circuit with Lincoln (1892) by Henry Clay Witney
Posthumous attributions