abdominal hair acne vulgaris adipose tissue adolescence adolescent sexuality adrenal cortex adrenal gland adrenarche adult ageing anabolic steroid androgen androgen receptor androgenic hair andrology andropause androstenedione anorexia nervosa anxiety appetite arcuate nucleus aromatase attachment theory beard body body odor bone brain breast calorie central nervous system chest hair child child development child development stages child sexuality childhood cultural-historical psychology cyst dehydroepiandrosterone delayed puberty developmental psychology developmental stage theories dietary fiber digital object identifier dihydrotestosterone ejaculation endocrine system endocrinology endometrium england epidemiology erection erik erikson estradiol estrogen estrogen receptor estrous cycle facial hair fatty acid fertilisation fertility follicular phase fundamental frequency gamete gametogenesis gene germ cell gonad gonadarche gonadotrope gonadotropin gonadotropin-releasing hormone gonocyte growth hormone gynecomastia hair hebephilia hormone human physiology human sexual behavior hypothalamic-pituitary-gonadal axis hypothalamus infant infant and child development infection inflammatory bowel disease insemination international adoption interstitial cell japan jean piaget john bowlby larynx lawrence kohlberg leptin leukorrhea lev vygotsky leydig cell libido luteal phase luteinizing hormone malnutrition maternal age effect medical test medical ultrasonography menarche menopause menstrual cycle menstruation middle age mons pubis moustache mucous membrane muscle navel neuron nipple norway nutrition obesity octave old age oocyte oogenesis oogonium orgasm ovarian follicle ovary oviparity oviposition ovoviviparity ovulation ovum paternal age effect pelvis penis peptide perspiration pheromone pituitary gland polychlorinated biphenyl pre- and perinatal psychology preadolescence precocious puberty pregnancy prenatal development progestagen progesterone protein psychosexual development psychosocial development pubmed central pubarche pubic hair reproduction reproductive system secondary sex characteristic senescence sertoli cell sex sex steroid sexual abuse sexual differentiation sexual dimorphism sexual intercourse sexual reproduction sigmund freud skin sperm spermatid spermatocyte spermatogenesis spermatogonium spermatozoon steroid stress surgery swelling table of development periods testosterone thelarche theory of cognitive development thigh tuberculosis uterus vagina virilization vivipary vocal folds voice box weight loss youth development