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The theory predicts that preferred mate choices have evolved to focus on reproductive potential and reproductive investment of members of the opposite sex.This theory predicts both intrasexual selection and intersexual choice due to differences in parental investment; typically there is competition among members of the lower investing sex (generally males) over the parental investment of the higher investing sex (generally females) who will be more selective in their mate choice.Females demonstrate a complementary pattern, being willing to accept considerably older males (on average 8 years older) and were also willing to accept males slightly younger than themselves (on average 5 years younger).This is somewhat different to our close evolutionary relatives: chimpanzees.The study found very few instances of older women pursuing much younger men and vice versa.Within sexual selection Darwin identified a further two mechanisms which are important factors in the evolution of sex differences (sexual dimorphism): intrasexual selection (involve competition with those of the same sex over access to mates) and intersexual choice (discriminative choice of mating partners).Age disparity in sexual relationships is the difference in ages of individuals in sexual relationships.

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Buss attributed the young age preference for females to the cues that youth has.However, human males tend to have more parental investment compared to mammal males (although females still tend to have more parental investment).Thus, both sexes will have to compete and be selective in mate choices.In August 2010, Michael Dunn of the University of Wales Institute, Cardiff completed and released the results of a study on age disparity in dating.