The "bedrock" of masculinity and femininity: bisexuality.
D000818:Animals; D002657:Child Development; D012734:Disorders of Sex Development / Q000209:etiology; D005190:Family; D005260:Female; D005824:Genetics, Behavioral; D005835:Genitalia / Q000196:embryology; D012739:Gonadal Steroid Hormones / Q000502:physiology; D006801:Humans; D007031:Hypothalamus / Q000502:physiology; D007062:Identification, Psychological; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D010262:Paraphilic Disorders / Q000209:etiology; D011574:Psychoanalytic Theory; D011606:Psychosexual Development; D051381:Rats; D012727:Sex Characteristics; D012730:Sex Chromosomes / Q000502:physiology; D012725:Sexual Behavior
D012739:Gonadal Steroid Hormones