title: Cross-species comparisons and the human heritage.
mesh_terms: D000818:Animals; D001070:Appetitive Behavior; D003259:Consummatory Behavior; D003307:Copulation; D005260:Female; D012739:Gonadal Steroid Hormones; D006716:Homosexuality; D006801:Humans; D008297:Male; D008418:Masturbation; D012724:Sex Attractants; D012725:Sexual Behavior; D012726:Sexual Behavior, Animal
chemical_list: D012739:Gonadal Steroid Hormones; D012724:Sex Attractants