Secondary Sex Characteristic

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displays his long, colored feathers, an example of his secondary sexual characteristics.

Secondary sex characteristics are traits that distinguish the two sexes of a species, but that are not directly part of the reproductive system. Some have argued that in general they evolution to give an individual an advantage over its rivals in courtship. They are opposed to the primary sexual characteristics: the sex organs.

Well known secondary sex characteristics include facial hairs of male lions, and long feathers of peacock. In humans most visible are breasts of females and beard and moustache of males. Secondary sex characteristics include the tusks of sea lions, the plumage of many male birds, the chemical indicators of many insects, etc.

In humans Sexual differentiation begins during gestation, when the gonads form. General habitus and shape of body and face, as well as sex hormone levels, are similar in prepubertal boys and girls. As puberty progresses and sex hormone levels rise, obvious differences appear.

Male levels of testosterone directly induce growth of the penis, and indirectly (via dihydrotestosterone (DHT)) the prostate. Estradiol and other hormones cause breasts to develop in females. However, fetal or neonatal androgens may modulate later breast development by reducing the capacity of breast tissue to respond to later estrogen.

In males, testosterone directly increases size and mass of muscles, vocal cords, and bones, enhancing strength, deepening the human voice, and changing the shape of the face and skeleton. Converted into DHT in the skin, it accelerates growth of androgen-responsive facial and body hair. Taller stature is largely a result of later puberty and slower epiphyseal fusion.

In females, breasts are the most obvious manifestation of higher levels of estrogen; estrogen also widens the pelvis and increases the amount of body fat in hips, thighs, buttocks, and breasts. Estrogen also induces growth of the uterus, proliferation of the endometrium, and menstrual cycle.

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In humans, secondary sex characteristics include:

Male

abdominal hair and chest hair, also more hairs on other parts of body
more facial hair
taller Human height, on average
higher waist-hip ratio, on average
broader shoulders and chest, wider than hips
heavier skull and bone structure
greater muscle mass and physical strength
a prominent Adam's apple and deep human voice
fat deposits mainly around the human abdomen and waist ("apple shape")
coarser skin texture
on average, larger hands and feet than women
lower digit ratio, on average

Female

enlarged breasts
shorter Human height, on average
lower waist-hip ratio, on average
wider in hip (anatomy)s Hips widen as part of the female pubertal process.
less facial hair
high voice
functional mammary glands
more subcutaneous fat
fat deposits mainly around the buttocks, thighs and hip (anatomy)s ("pear shape")
smoother skin texture
higher digit ratio, on average