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.

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. Jonathan Goldsmith is known as the most interesting man in the world, and always has a trimmed beard

REASONS WHY MEN GROW BEARDS Researcher shows that beards probably evolved at least partly to help men boost their standing among other men. 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 Advertisement

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

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.

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. Lenny Kravitz rocks out with his beard, but doesn't grow it too long

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.

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.

THE BEARDED STUDY 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. A study 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. Christian Bale goes back and forth between cleanshaven and a beard 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. Advertisement

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.

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. Some prefer actor Jake Gyllenhaal with a beard than without

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.

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.

FACIAL HAIR IS RIDDLED WITH BACTERIA WHICH MAY SPREAD GERMS AND TRIGGER INFECTIONS, EXPERTS CLAIM Beards can harbour more germs than a toilet +6 Beards can harbour more germs than a toilet Experts have warned that beards are nothing more than a 'bacterial sponge', riddled with thousands of bacteria - and a perfect way to pass on germs. Carol Walker, a consultant trichologist from the Birmingham Trichology Centre, said having facial hair can lead to more frequent skin infections and to germs being passed on to others. Beards harbour more germs because facial hair is courser than other hair, so traps dirt and germs more easily, she explained. She told MailOnline: 'Beard hair; it’s courser. It has the shape of a bayonet, a round, convexed bottom and then comes up the side to a point. ‘It becomes curly and smooth, it tends to have more bends and kinks which trap dirt. ‘The cuticles on the hair – which are like layers of tiles on a roof - trap the germs and grease. ‘Hair around nostrils and mouth is well-placed to harbour bacteria. A participant poses for photographers during the "World Beard Championship" in Leogang, in the Austrian province of Salzburg. She added that people have a habit of over-handling their beards, meaning they can spread bacteria to their mouths. She said: ‘If their hands are dirty, they transfer dirt from their hands on to their face and mouths. ‘If someone eating dairy products it can get stuck in their beard and become a bit rancid. ‘There can be a lot of Stepholococci [a group of bacteria that can cause illness] if someone’s got a cold.’ She has noticed people developing skin conditions due to their facial hair. She said: ‘Some people get skin infections, caused if they have a lot of scale build up or eczema from the bacteria in their beard. ‘If someone has a cold, a runny nose it can trickle down and be trapped in the nose, beards. Food drink can dribble down too.' Advertisement

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.

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.