"Sex and/or Mr. Morrison" is a short story by Carol Emshwiller from Harlan Ellison's science fiction anthology Dangerous Visions. It has been republished in Emshwiller's 1974 collection Joy In Our Cause, in Pamela Sargent's 1975 anthology Women of Wonder, in Emshwiller's 1990 collection The Start of the End of It All, in Lisa Tuttle's 1998 anthology Crossing the Border, in Michael Bishop's 2009 anthology Passing for Human, and in the 2011 Collected Stories of Carol Emshwiller, Vol. 1; it has also been translated into French and Dutch.