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About this book
What happens at puberty?
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adolescence alcohol baby bacteria bladder blood vessels body bones boys brain breasts develop Calories cause cervix changes of puberty clitoris combined pill condom contraception cream cycle diaphragm doctor drugs ejaculates epididymis erect penis especially estrogen exercise feel female sex hormones female sex organs female's follicle foods foreskin genitals girls grow growth spurt homosexuality hymen infection inside internal sex organs kissing labia lungs male sex organs male's masturbation method of contraception milk muscles muscular nails nipples non-sexual normal orgasm ovaries ovulation ovum pain pelvis penis person pimples pituitary pregnancy produced progesterone puberty pubic hair safe period sebaceous gland sebum secondary sexual feature semen sex cells sex hormones sex organs sexual intercourse sexually transmitted disease shave skin Slang word smoking someone spermicide starts sterilization substance called tampons teeth testes testosterone toilet towels urethra usually Uterine tube uterus vagina vulva wash weight woman women