  To the extent that the above two types of feminist theory are pinpointing some kind of specific difference between the sexes, they raise concerns about essentialism or identifying distinct values that women have as women. Such concerns are part of a larger set of criticisms that have run through feminist theorizing since the 1970s, with non-white, non-middle-class, and non-western women questioning the very category of “woman” and the notion that this title could be a boundary-spanning category that could unite women of various walks of life. (See the entries on  identity politics and  feminist perspectives on sex and gender.)  Criticisms of a unitary identity of “woman” have been motivated by worries that much feminist theory has originated from the standpoint of a particular class of women who mistake their own particular standpoint for a universal one. In her 1981 book, Ain’t I a Woman?: Black women and feminism, bell hooks notes that the feminist movement pretends to speak for all women but was made up of primarily white, middle class women who, because of their narrow perspective, did not represent the needs of poor women and women of color and ended up reinforcing class stereotypes (hooks 1981). What is so damning about this kind of critique is that it mirrors the one that feminists have leveled against mainstream political theorists who have taken the particular category of men to be a universal category of mankind, a schema that does not in fact include women under the category of mankind but marks them as other (Lloyd 1993).