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abdomen adolescence affection amniotic amniotic sac associated baby's eyes become biological birth blood stream blood vessels body cell boys and girls Caesarean Caesarean section called cause cell division changes child childhood cord desire embryo emotional maturity exist experience Fallopian tube female fertilized egg flow function genital organs germ Gonorrhea Growing Into Maturity growth high school hormones human individual infection influence instincts intercourse known male mammal marriage married mass of cells mating season meaning of sex menopause menstrual period menstruation mental mother mother's blood mucous membrane nocturnal emission normal occur offspring opposite sex ovaries parents penis person physical attraction placenta pregnancy prostate gland prostitution puberty relating to sex repro responsible seminal fluid seminal vesicles sex impulse sex organs sex problems skin social sometimes sperm cell syphilis tion tissue twenty-eight days usually uterine uterus venereal diseases Wassermann test wholesome woman women worry X chromosome young