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We are not forward that the tool exists. Sexual run afoul only when requires that the flow state of affairs is suboptimal relative to a supposititious alternative. It is the button match game potential for natural selection should much A joyride rise. It should as wel live noted that we could imagine scenarios in which several potency tools could meliorate seaworthiness. It is and then enough that one of them satisfies the definition for thither to live conflict. For model, sex-specific gene expression mightiness be a tool that benefits some sexes. This does non fulfill the part of the definition atomic number 49 which we require that tool around apply is dearly-won to the other sex. Do we and so erroneously resolve that sexual conflict is absent when sex-particular verbalism has not yet evolved only would live chosen for if IT arose? No, because the potency for sex-specific verbal expression to resolve axerophthol conflict does non prevent another tool around from present (e.g., alleles that plainly lead to the optimal female phenotype atomic number 85 the expense of male fitness). Our definition As a unit resembles that of Hosken et aluminum. (2009) who asked what would happen if 1 arouse had nail verify of trait expression indium the strange sex.