ðɪs aɪdˈiə ɐɡɹˈiːz wɪððə sˈɛkʃuːəl sᵻlˈɛkʃən θˈiəɹi, wˌɪtʃ pɹɪdˈɪkts ðæt fˈiːmeɪlz wʊd ˈækt ɪn wˈeɪz tə mˈæksɪmˌaɪz ðə njˈuːtɹiənt mətˈɪɹiəl ðeɪ ɹᵻsˈiːv ænd pɹɪdˈɪkts ðæt mˈeɪlz wʊd ˈækt ɪn wˈeɪz tə mˈæksɪmˌaɪz ðə ɹᵻtˈɜːn ˌɔn ðɛɹ ɪnvˈɛstmənts.
This idea agrees with the sexual selection theory, which predicts that females would act in ways to maximize the nutrient material they receive and predicts that males would act in ways to maximize the return on their investments.