Beyond fashion, beard and tattoos on the body were two historic hallmarks of masculinity, first as a more or less inevitable transformation of the child in man sign and the latter as a kind of voluntary mark (one which also hurts when done).
In this, as in other aspects of "being a man" very much about the culture, but it seems science also has some few words about it.
Recently, Cyril Grueter and other researchers at the University of Western Australia conducted a study of psychosocial cut over 154 species of primates, including our own.
As is known, in general primates evolved to live in communities, some simple and few members (as the case of spider monkeys) and other more numerous and complex (as with the gorillas, chimpanzees and Homo sapiens).
In the latter, the competition is greater in several respects, and sexually males are forced to stand for females.
According to that study, primates living in hierarchical societies also developed ways to make visible their "identity, rank, dominance or attractive" for females Grueter group explains:
In large groups where individuals are surrounded by strangers, we need a fast and reliable tool to assess the strength and quality of the other, and that is where enter these elaborate ornaments.
The conclusion, then, is simple:
Men are left beard and tattoos for attention.
Sexually.
Women are attracted to these "ornaments" because evolutionarily are an inexpensive way to detect a male with attractive to mate and form a pair features when you need to make a quick assessment or do not have the time or increased information.
Beards and tattoos are a way through the crowd, a man stands to quickly draw attention to their masculinity and suggest that you have adequate genetics to have children.
Some researchers theorize that even the most sophisticated behaviors such as poetry or mathematics are tools courtship with which the human being seeks poach its primary biological goal.
Even the human brain, with all its complexity, could be equivalent to the iridescent peacock tail.
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