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According to one study, men with longer hair and beard may have smaller testicles than those who have trouble growing hair.
He revealed that humans, and over a hundred other primates, are facing an evolutionary dilemma with respect to their bads.
Teams from the University of Western Australia, who conducted the research, said that a man "can be well adorned or well endowed, but it's hard to be both." ".
Animals can either invest energy by attracting females with an impressive mane and beard, or expend energy to grow larger gonads.
This means that hairy men with bushy beards and long hair will probably have smaller testicles than their wildly overflowing brothers.
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For the other primates of the world, this compromise consists of having either the brilliant bad of a baboon, or the simple features and large testicles of simpler primates.
Dr. Cyril Grueter, co-author of the University of Western Australia study, said the size of the testicle varied enormously and was related to the appearance of a man.
& # 39; Some [primate] The species have flamboyant attributes like beard, mane, cape and cheeks, as well as various shades of color on the face and coat, "he said.
"Others are rather drab and more like your average gentleman.
"This discovery clearly shows that you can be well trimmed or well endowed, but it's hard to be both."
The discovery comes from a study that examined the testicular size of over 100 species of primates and found that the gonads vary greatly depending on the animals.
The animals with the smallest testicles had gonads the size of a peppercorn while the larger ones were comparable to those of a tennis ball.
The researchers explain that poorly endowed men devote all their energy to attracting companions with the help of the beard and long hair and that they no longer have to invest in their bads.
The researchers chose to study the size of the primate testis, which varies greatly from one population to the next.
Researchers suspect one of the reasons is that attempting to do both requires too much energy.
He explains that all males aspire to the same thing: to have a child.
"But they can not all have what they want," said Dr. Grueter. "So, how do they succeed?
"Well, apart from the simple fight, they can produce what are called" status badges "; eye-catching ornaments that help their bearers control access to women by intimidating other men.
"And if men can not prevent others from their wives, they can win by producing a lot of sperm to overwhelm those of their rivals."
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