 Although feminists such as Fraser, Judith Butler, and Wendy Brown have been highly critical of the radical feminist account of domination, analytic feminists have found this account more productive. For example, Rae Langton (2009) has used speech act theory to defend MacKinnon's claims that pornography both causes and constitutes women's subordination. More generally, Langton (2009) and Sally Haslanger (2012) have drawn on MacKinnon's work to develop an account of sexual objectification and to explore the ways that objectification is often obscured by claims to objectivity (for further discussion of Haslanger's work, see section 3.7 below).