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During early adolescence boys will experience frequent erections since this is the normal response of the male body to sexual excitement. Erections can also occur spontaneously for no apparent reason at all as boys' bodies adjust to the extreme chemical and hormonal changes initiated during puberty. Similarly, girls may find they produce vaginal secretions for no apparent reason, even when they're not menstruating. Sometimes, these secretions are caused by sexual arousal, but increased vaginal secretions can also be caused by normal hormonal fluctuations during their monthly cycle.

By ages 13-14 years, guys will have a more obvious interest in sex than girls do, but girls are interested in sex as well. Guys will have even more frequent erections at this age. It's quite normal for guys to experiment with their erections and their sexual arousal through masturbation. Because sexual pleasure is a new experience, boys may want to masturbate quite frequently. Since indicators of girls' sexual arousal are not as overtly obvious as boys' erections, girls may not masturbate as frequently because they may be less aware of their sexual arousal.

One important thing to know is that youth under age 18 commit a substantial number of the sex offenses committed in the United States. At least one-third of all sexual abuse of children is committed by boys and girls under 18. And according to the U.S. Department of Justice, adolescents account for about 17 percent of all arrests for sex offenses. Boys commit the majority of these offenses, an estimated 90 percent, and girls commit about 10 percent of the offenses.

For boys, the androgen testosterone is the principal sex hormone; while testosterone is produced, all boys' changes are characterized as virilization. A substantial product of testosterone metabolism in males is the estrogen estradiol. The conversion of testosterone to estradiol depends on the amount of body fat and estradiol levels in boys are typically much lower than in girls. The male "growth spurt" also begins later, accelerates more slowly, and lasts longer before the epiphyses fuse. Although boys are on average 2 centimetres (0.8 in) shorter than girls before puberty begins, adult men are on average about 13 centimetres (5.1 in) taller than women. 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.[15]

The hormonal maturation of females is considerably more complicated than in males. The main steroid hormones, testosterone, estradiol, and progesterone as well as prolactin play important physiological functions in puberty. The production of gonadal steroids in girls starts with production of testosterone, which is typically quickly converted to estradiol inside the ovaries. However the rate of conversion from testosterone to estradiol (driven by FSH/LH balance) during early puberty is highly individual, resulting in very diverse development patterns of secondary sexual characteristics. Production of progesterone in the ovaries begins with the development of ovulatory cycles in girls (during the lutheal phase of the cycle), before puberty low levels of progesterone are produced in the adrenal glands of both boys and girls. Estradiol levels rise earlier and reach higher levels in women than in men. While estradiol promotes growth of the breasts and uterus, it is also the principal hormone driving the pubertal growth spurt and epiphyseal maturation and closure.[16]

During this period, also in response to rising levels of estrogen, the lower half of the pelvis and thus hips widen (providing a larger birth canal).[51][63] Fat tissue increases to a greater percentage of the body composition than in males, especially in the typical female distribution of breasts, hips, buttocks, thighs, upper arms, and pubis. Progressive differences in fat distribution as well as sex differences in local skeletal growth contribute to the typical female body shape by the end of puberty. On average, at 10 years, girls have 6% more body fat than boys.[64]

One possible cause of a delay in the onset of puberty past the age 14 in girls and 15 in boys is Kallmann syndrome, a form of hypogonadotropic hypogonadism (HH). Kallmann syndrome is also associated with a lack of sense of smell (anosmia). Kallmann syndrome and other forms of HH affect both men and women. It is caused by a failure in HPG axis at puberty which results in low or zero gonadotropin (LH and FSH) levels with the subsequent result of a failure to commence or complete puberty, secondary hypogonadism and infertility.[73][74]

Chronic diseases can delay puberty in both boys and girls. Those that involve chronic inflammation or interfere with nutrition have the strongest effect. In the western world, inflammatory bowel disease and tuberculosis have been notorious for such an effect in the last century, while in areas of the underdeveloped world, chronic parasite infections are widespread.

The sequence of events of pubertal development can occasionally vary. For example, in about 15% of boys and girls, pubarche (the first pubic hairs) can precede, respectively, gonadarche and thelarche by a few months. Rarely, menarche can occur before other signs of puberty in a few girls. These variations deserve medical evaluation because they can occasionally signal a disease.

However, a significant portion of testosterone in adolescent boys is converted to estradiol. Estradiol mediates the growth spurt, bone maturation, and epiphyseal closure in boys just as in girls. Estradiol also induces at least modest development of breast tissue (gynecomastia) in a large proportion of boys. Boys who develop mild gynecomastia, a swellings under nipples, during puberty are told the effects are temporary in some male teenagers due to high levels of estradiol.

It may be worrisome to find your child touching their genitals for pleasure. Many parents think that masturbation is something that emerges during adolescence with hormonal and secondary sex characteristics such as erections for boys and menstruation for girls. However childhood masturbation, often called genital stimulation and touching, usually starts around 2 months of age but can sometimes start in utero.

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