 Bias. The largest body of work in feminist philosophy of biology concerns revealing and eliminating sexist and androcentric bias. Central and early work in the field documented the presence of assumptions of female passivity and male activity in a wide range of biological accounts of sex and gender. Examples include critique of research on sex determination (Birke 1986, Bleier 1984), fertilization (Martin 1991), human evolution (Bleier 1984, Fausto-Sterling 1985/1992, Hubbard 1990) and the discipline of primatology (Hrdy 1986, 1997, and Haraway 1989). More recently, Elisabeth Lloyd (1993, 2005) has studied biological explanations of women's orgasm. She demonstrates that these accounts often rely on two false assumptions, assumptions that involve (1) presupposing that these explanations need to be based on natural selection and (2) presupposing a tight link between women's sexuality and reproduction. Feminist research on sexist bias in biology focuses on eliminating myths of female biology that are colored by contemporary social values and facilitating the production of biological research that more accurately reveals the facts about sex and gender. In this sense a feminist perspective is seen as a sort of control, with the goal of removing gender bias, i.e., sexist and androcentric social values, from scientific research. For example, The Biology and Gender Study Group (1988, 61–62) write that,