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Reproductive Possibilities - Primary Characteristics
Ψ Males
• Rapid growth of penis & scrotum at 12 or 13
• Comparisons can be embarrassing, but are meaningless in terms of function
• First ejaculation of semen around age 12 - spermarche
• Nocturnal emissions
Ψ Females
• Menarche is preceded by enlargement of the breasts, appearance of pubic hair, & broadening of the hips & shoulders.
• Next, the uterus, vagina, labia, & clitoris develop to mature proportions
Sexual Appearance - Secondary Characteristics
• Breast development. First “buds” develop, then the larger breast. Nipples increase in size and darkness. To a much lesser degree, this happens in some males.
• Body hair. Pubic hair progresses from fuzz to darker hair; underarm hair begins.
• Voice. Males’ larynxes enlarge, creating larger resonance chambers.
Human Growth & Development
Robert C. Gates
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