Evolutionary biology. All's fair when love is war.
Keller
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D000818:Animals; D005075:Biological Evolution; D004331:Drosophila melanogaster / Q000502:physiology*; D005260:Female; D008017:Life Expectancy; D008297:Male; D012098:Reproduction / Q000502:physiology; D012661:Semen / Q000502:physiology*; D012726:Sexual Behavior, Animal