Because the shape of the female lower body is often seen in the shape of the wood, and abalone, butterflies, willow leaves and other shapes,

If it is black, the evil male are saying that this is the number of sexual relations caused by the black, describing the person is very yin slut. In fact, this a fallacy, uneducated evil-minded people will think so.

Black labia are basically factors related to skin color, different skin color labia color is different, there is also a factor of pigmentation. Of course do not rule out the panties long years strangled too tight, poor ventilation factor.

On the contrary, the pink color is called pink fungus