Trump's signature hairstyle is actually more flip-over than comb-over. The Republican presidential candidate has said that he would banish the 'do if he were elected President because it is too time consuming. Click through our gallery to see other styles that are popular.
Forget what you've heard about the comb-over. It is an increasingly popular hairstyle among young men and no longer just about covering bald spots, as seen here on David Beckham.
Some men who are not ready to accept the hair loss that often comes with age choose hair plugs. The procedure has improved over the decades, since Joe Biden is thought to have received them. It can now give men a more natural looking hairline.
The pompadour is to Justin Bieber what the flip-over is to Trump. Like other tress-setters, Bieber has possibly made this vintage hairstyle as famous as his creative achievements.
Balding can make men look wise and established, like Prince William, although most would probably prefer the youthful appearance of a full head of hair.
In the Middle Ages, Christian monks shaved the tops of their heads to show their religious devotion. It may also have had the effect of making them look wiser, just as a bald head does for men today, as seen here on actor Brian Baumgartner.
Similar to a shaved head, facial hair can make the wearer look older, more established and even more aggressive (like Bryan Cranston's "Breaking Bad" character, Walter White). It can also make him look like a renegade or hippie, which may be why they are not usually seen on politicians. But research suggests that a little stubble can make men more attractive to women.
Although a bald head can make men look older, it is often better than the alternative of a head full of obviously thinning hair. Many men are trying to beat Mother Nature at her own game by shaving it all off. And research suggests that a bald head could have its benefits, with both men and women find bald men to be more assertive and stronger looking. We're looking at you, Vin Diesel.
The stereotype of the long-haired hippie still holds true. Men who let their hair grow out are generally telling the world that they are more rebellious -- like when Jared Leto had long locks. Professional and older men generally opt for traditional short haircuts, which have not changed much over time.