Terminal hair

[1][2] During puberty, the increase in androgenic hormone levels causes vellus hair to be replaced with terminal hair in certain parts of the human body.

[3] These parts will have different levels of sensitivity to androgens, primarily of the testosterone family.

[4] The pubic area is particularly sensitive to such hormones, as are the armpits which will develop axillary hair.

[5] Pubic and axillary hair will develop on both men and women, to the extent that such hair qualifies as a secondary sex characteristic,[6] although males will generally develop terminal hair in more areas.

[7] Human females on the other hand generally retain more of the vellus hair.