 Metaphor is not the only avenue through which projections occur. Assumed similarity of the experience of men and women and the further assumption that the experiences of men are the norm is another. Elisabeth Lloyd’s extended case study of accounts of female orgasm illustrates how an assumption of this sort can prevent the consideration of relevant evidence (Lloyd 2005). She examines 21 accounts (hypotheses) proposed for giving an evolutionary explanation for female orgasm—a seeming anomaly in that it does not appear to be necessary for reproduction. Of these, only one (the byproduct account proposed by Donald Symons in 1979) incorporates a key piece of evidence—that many women do not experience orgasm with intercourse and many women do experience orgasm without intercourse.