A study has claimed that men who have long hair or a beard may have smaller testicles than those who struggle to grow hair.
Men with bushy beards and long hair may have smaller testicles than their counterparts who struggle to grow facial hair, suggests a new study.
This bold claim was made by a team from the University of Western Australia and the University of Zurich, who have studied the gonads of more than 100 different male primates as part of their research.
According to the scientists, male primates all fall victim to an evolutionary problem with their genitals.
Essentially the study found that males can either be "well endowed" and have large balls, or are instead "well-adorned" with hair.