it gets in the way, stuck in your teeth/throat, covers up what is a beautiful object [either species]. Whip it off razor/Immac or wax smooth is best ;+O))
It occurs on the body in the places that are most likely to get rubbed against another part of the body or indeed another body altogether and acts as an anti-friction coating.
i read somewhere recently that it dates from caveman times, when they used to squat round the fire while eating. It alerted them to the fact that an insect or something was in the sensitive area
I don't know about men but it has been suggested that in women especially before underwear was invented, I assume this would go back to the cave that it kept dirt, insects etc out of a delicate area.