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Recent research on the evolution of language indicated that language serves as a sexually-selected fitness indicator that is an adaptation showing an individuals suitability for being a reproductive mate. This should especially be the case for male individuals due to past sex-different selection pressures causing women to be more demanding in mate choice on average than men. There was some indirect evidence for this position: Many linguistic traits are highly heritable, while naturally-selected traits (i.e., those which do not mainly serve reproductive purposes) are only marginally heritable....