Beards may be totally "in," but they are also dirty, and hazardous to human health according to a recent study. A new study found that every sample of beard hair collected was crawling with bacteria. Nearly half had bugs and bacteria considered hazardous to human health, the Daily Mail reports.

Are beards dirtier than toilet seats?

Watch out bearded men, your facial hair might be dirtier than you think. Microbiologists in Albuquerque, N.M. recently found that men's facial hair can contain as much bacteria as your average toilet seat, according to Action 7 News.

Are beards aggressive?

Beards also impact perceptions of aggression. A research study showed photographs of bearded and non-bearded men with both groups pulling the same aggressive facial expressions, such as scowling and barring their teeth. The bearded men were rated significantly more aggressive and intimidating than the clean-shaven men.