What is the main physical difference between a man a woman? Besides the obvious, its facial hair.
Facial hair is the second major characteristic between humans because it is unique to one sex. As long as there have been men, there has been facial hair. Now whether its a beard, mustache, sideburns, or any facial hair for that matter men all have one problem in common.
The fact is grooming facial hair can be a very messy and time consuming task. Imagine all those tiny little hairs all over your sink, the counter, your clothes, the soap, toothbrush eventually clogging the drains.