 The methods for testing hypotheses in evolutionary psychology come mostly from psychology. For example, in Singh’s work, male subjects are presented with drawings of women with varying waist hip ratios and ask to give their preference rankings. In Buss’s work supporting several hypothesized mate selection mechanisms, he performed similar experiments on subjects, asking for their responses to various questions about features of desired mates (Buss 1990). Buss, Singh and other evolutionary psychologists emphasize the cross cultural validity of their results, claiming consistency in responses across a wide variety of human populations. (But see Yu and Shepard 1998; Gray et al. 2003 for different types of conflicting results to Singh’s.) For the most part standard psychological experimental methods are used to test hypotheses in evolutionary psychology. This has raised questions about the extent to which the evolutionary component of evolutionary psychologists’ hypotheses is being tested (see e.g. Shapiro and Epstein 1998; Lloyd 1999; Lloyd and Feldman 2002). A response profile may be prevalent in a wide variety of subject populations but this says nothing about whether or not the response profile is a psychological mechanism that arose from a particular selective regimen.