 Although Symon’s account is not without problems, Lloyd argues that it fits the evidence better than the alternatives. Symons proposes that female orgasm is a byproduct of evolution rather than a result of natural selection, a hypothesis that he is able to consider because he is not assuming that orgasm in females must serve a reproductive function since it does in males. His explanation for female orgasm is that the biological development of males and females is parallel so that the features that lead to orgasm in males (nerves, erectile tissues, etc.) are also present in females, but not always activated. Female orgasm is thus a byproduct of human evolution in much the same way that male nipples are a byproduct and just as the male nipples play no role in human reproduction neither does female orgasm.