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abortion achieved adolescent adult allow American animal baby become begins behavior biological birth blood boys called capacity cells cervix Chapter chemical child clitoris companionship contraception couple created cultural dependent difficult divorce doctors drive embryo emotional endometrium environment erection estrogens ethical experience fact Fallopian tubes feel female body fertilized fetus fluid follicle genitals girls gland grow growth homosexuality hormonal balance household important inches individual less live male body mammals marriage married masculine Masters and Johnson masturbation mature means menstrual cycle morality mother muscles nature normal occur organs orgasm ovaries ovulation parents partner pedophilia penis period person phase physical physiology placenta possible pregnancy Primary Sex Characteristics prostate psychic puberty question relationship reproduction romantic love semen seminal sexual activity sexual intercourse social society sometimes sperm spouse sterile testicles usually uterus vagina woman women young