As a result of high levels of male parental investment, humans evolved into a somewhat androgynous species - a species in which human females exhibit traits generally found only in males (e. g., competition for mates) and human males exhibit traits generally found only in females (e. g., the provision of parental care; choosiness about mates).

(p. 138) - The Ape that Thought It Was a Peacock: Does Evolutionary Psychology Exaggerate Human Sex Differences? (2013)