Most of the studies have reported that menarche may occur a few months earlier in girls in high-stress households, whose fathers are absent during their early childhood, who have a stepfather in the home, who are subjected to prolonged sexual abuse in childhood, or who are adopted from a developing country at a young age. Before puberty, the larynx of boys and girls is about equally small. The peak of the so-called "strength spurt", the rate of muscle growth, is attained about one year after a male experiences his peak growth rate. Another androgen effect is increased secretion of oil sebum from the skin. More detail is provided in the menarche article.
The major adrenal androgens are dehydroepiandrosterone , androstenedione which are precursors of testosterone , and dehydroepiandrosterone sulfate which is present in large amounts in the blood. Boys who have earlier pubertal timing generally have more positive outcomes in adulthood but more negative outcomes in adolescence, while the reverse is true for later pubertal timing. There is a large range in amount of body hair among adult men, and significant differences in timing and quantity of hair growth among different racial groups. Accusations of bias based on political agenda sometimes accompany scientific criticism. This change increases the susceptibility to acne , a skin condition that is characteristic of puberty. Evidence is accumulating that the reproductive system is not totally inactive during the childhood years. Testosterone will cause an enlargement of the clitoris and possibly has important effects on the growth and maturation of the vestibular bulbs , corpus cavernosum of the clitoris and urethral sponge. Its primary target organ is the hypothalamus. Most of the voice change happens during stage of male puberty around the time of peak growth. In the vulva and vagina, estradiol causes thickening stratification of the skin and the growth of both the myoepithelial layer and the smooth muscle of the vagina. Mechanisms of these social effects are unknown, though a variety of physiological processes, including pheromones , have been suggested based on animal research. A study  discovered that a mutation in genes encoding both Neurokinin B as well as the Neurokinin B receptor can alter the timing of puberty. One of the first observed environmental effects is that puberty occurs later in children raised at higher altitudes. Much evidence suggests that for most of the last few centuries, nutritional differences accounted for majority of variation of pubertal timing in different populations, and even among social classes in the same population. The most important of the environmental influences is clearly nutrition, but a number of others have been identified, all which affect timing of female puberty and menarche more clearly than male puberty. LH luteinizing hormone is a larger protein hormone secreted into the general circulation by gonadotrope cells of the anterior pituitary gland. By stage 4, the pubic hairs densely fill the "pubic triangle. Most of this sex difference in adult heights is attributable to a later onset of the growth spurt and a slower progression to completion, a direct result of the later rise and lower adult male levels of estradiol. On the other hand, late-maturing boys develop lower self-esteem and confidence and generally have lower popularity among peers, due to their less-developed physiques. The ovaries or testes respond to the rising amounts of LH and FSH by growing and beginning to produce estradiol and testosterone. Estrogen increase glycogen content in vaginal epithelium , which in future plays important part in maintaining vaginal pH. Erections Erections during sleep or when waking up are medically known as nocturnal penile tumescence and colloquially referred to as morning wood. The median age of menarche for a population may be an index of the proportion of undernourished girls in the population, and the width of the spread may reflect unevenness of wealth and food distribution in a population. Such erections can be embarrassing if they happen in public, such as a classroom or living room. Leptin has receptors in the hypothalamus which synthesizes GnRH. The rise in GnRH might also be caused by genetics.
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