What is the point of a beard, evolutionarily speaking?
Children, women, and a whole bunch of men manage just fine without one. But
take a walk down some streets these days and you’ll be confronted with all
sizes and shapes of groomed (and less groomed) facial hair – from designer
stubble to waxed moustaches and hipster beards.
When we see men paying attention to their appearance,
it’s easy to assume that they’re just angling for partners. But our research on
beards and voices shows that
beards probably evolved at least partly to help men boost their standing among
other men.
Compared to males and females of many other primates,
men and women on average look very
different from each other – partly thanks to men’s facial
hair. And when we see differences between males and females, the explanation
often boils down to evolution through sexual selection –
the process that favours traits that boost mating opportunities.
But interestingly, women don’t seem that interested in
beards. While some studies have found that women like a bit or
even a lot of
facial hair on men, other studies have
reported that they prefer the
clean-shaven look. The lack of consistent evidence means we
can’t conclude that beards evolved because women were attracted to them.
Researchers have therefore suggested that a second
type of sexual selection may hold the answer. To reproduce, it’s often not
enough to simply be attractive. You also have to compete with the same sex for
mating opportunities. The funny, shy guy at the back of the bar isn’t going to
stand a chance when competing with his bolshier brothers otherwise. And there’s
evidence that beards evolved to help men do just that.
In times with a greater proportion of single men
competing for fewer women, beards and moustaches became more fashionable
A man’s ability to grow a fulsome beard isn’t actually
neatly linked to his testosterone levels. Despite this, a
number of studies have suggested that both men and women perceive men with
beards as older, stronger and more aggressive than
others. And dominant men can get more mating opportunities by intimidating
rivals to stand aside.
This is something that holds true both in modern times and
throughout human history.
Dominance can provide a staggering short-cut to mating opportunities: genetic
evidence indicates that about 8% of the male population of Asia today is a
descendent of Genghis Khan and his family.
A study by
the appropriately-named Nigel Barber linked British facial hair fashions
between 1842 and 1971 to the ratio of men to women in the marriage market. It
found that in times with a greater proportion of single men competing for fewer
women, beards and moustaches became more fashionable.
Beards aren’t the only feature that can convey
dominance – voices do too. People tend to vote for leaders with
lower-pitched voices, and during competitive tasks men lower the pitch of their
voice if they think they are
more dominant than their opponent. Like facial hair, voice pitch
also easily distinguishes men and women.
To help trace the evolutionary origin of beards and
voices, we tested whether
they were seen as attractive, dominant or both. We asked 20 men and 20 women to
rate the dominance and attractiveness of six men who were video-taped on four
occasions as they let their facial hair grow. We then used computer software to
create four versions of each video where the men’s voices had been changed to
sound higher and lower-pitched.
Beards didn’t affect a man’s attractiveness rating
consistently, but those who let their facial hair grow were perceived as more
dominant
We found that male voices that sounded deeper than
average were rated as the most attractive. Really deep or high pitches weren’t
as popular. In contrast, men’s voices were perceived as increasingly dominant
the lower they were. Beards didn’t affect a man’s attractiveness rating
consistently, but those who let their facial hair grow were perceived as more
dominant than others – in line with previous research.
The tension between attracting a mate and competing
with others doesn’t just apply to beards and voices. Men on average also think
their body should be more muscular than women report that they want,
while women on average believe they need to be thinner and wear more make-up than
men report that they want. We’re not always that great at judging what the
other sex finds appealing, but maybe that’s in part because our instincts are
to out-compete our peers as well as attract a partner.
Of course, most of this research has been carried out
within western populations. Make-up use, average body composition, and even the
very ability to grow facial hair all differ enormously across the world –
meaning we could get different results elsewhere.
But the point is that, whether it’s facial hair or
something else, we often see this pattern of competing requirements leading to
differences in appearances. Think you can please everyone all of the time? You
can’t.
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