A recent study claims that men with longer hair and beards may have smaller testicles than those who struggle to grow facial hair.
Teams from the University of Western Australia, who carried out the research, say a male “can be well-adorned or well-endowed, but it’s hard to be both”, Daily Mail reports.
This means hairy human men with a bushy beard and long hair are likely to have smaller testes that their clean-shaven brethren. According to the study, animals can either invest energy attracting females by growing out their hair and beards or spend their energy growing larger testis.
Primatologist and study co-author Dr Cyril Grueter, from the University of Western Australia, said testicle size varies enormously and is linked to a male’s appearance.
He said: “Some [primate] species sport flamboyant accoutrements such as beards, manes, capes and cheek flanges, and various shades of colour in their faces and fur.
“Others are pretty drab and look more like your Mr Average.
“This finding clearly shows that you can be well-adorned or well-endowed, but it’s hard to be both.”