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Symons argues that women and men have different sexual natures, apparent in their typical "sexual behaviors, attitudes, and feelings", but partially concealed by moral injunctions and the compromises inherent in relations between the sexes. The genetic sex determination cascade in Drosophila. Because homosexuals do not have to "compromise sexually with members of the opposite sex" their sex lives "should provide dramatic insight into male sexuality and female sexuality in their undiluted states. In many other species, sex determination itself is entirely plastic, and in yet others individuals can even change sex. In contrast to Roughgarden, we do not claim that this is a reason to reject sexual selection evolutionary perspctive and sex, see Prospects below. She received her Ph. Humans are a rather extreme example of this because human babies are extraordinarily energetically costly to raise when you consider both their relative helplessness at evolutionary perspctive and sex and prolonged childhood.