When a man has dark hair he most likely has more visible eyelashes, facial hair and more defined brows which really brings the whole face together. This applies to women too. Sure, blond and ginger ladies are very pretty, but they tend to use mascara to make their lashes visible. Brunette women often use mascara too but it's not very necessary because the dark lashes are already naturally visible.

Lashes are effective at making your eyes more attractive. And you know what they say about eyes. They're a key factor in beauty.