Follicly challenged men envious of their mates' beard-growing abilities can take some comfort in the findings from a new study, which reveals a link between hairy men and their testicles.
The University of Western Australia has found humans, along with 100 other primates, can be "well-adorned or well-endowed, but it's hard to be both."
For an animal, their energy is either invested in producing a glorious mane to attract a mate, or growing large gonads.
For the human male, this translates to long hair and an impressive beard, countered by smaller attributes in their nether-regions.
According to the study's primatologist and co-author, Dr Cyril Grueter, testicle size varies enormously and is linked to a male's appearance.