Evolutionary modifications of this type are common. The hair-tuft glands of many mammals are frequently a contrasting color to their surroundings. The genital area, then, affords the observer with a quick estimate of sexual maturity in an unclothed society, with all the sexual implications thereof. Unlike the corn-silk axillary or anogenital tuft, this pubic patch became more dense and matted, like the hairs of the beard. The visual role of axillary and pubic hair can be seen in some expression of human behavior in Western society.
Women often shave the axillary hair to effect the pre-puberty look.
Social odors in other animals are used primarily for status communication, though there are many cases where special odors are used as sexual lures as well. Our human odors are used as sexual from the axilla and crotch arose primarily to give an aromatic accent to status well back in our evolutionary past, and have been retained for that same function. Their offensive character is not inconsistent with other threat, signals - when they become concentrated. On the behavioral side, we label offensive and vulgar any dominant who flaunts his superiority in a belligerent manner. Some of our cultural shifts throughout history have complicated our ancestral use of odor in communication.