The color pink usually serves two purposes. It can be used to show childish innocence, or a characters child-like personality. It can also be used to show a more flirtatious personality. Pink is normally a color associated with girls and femininity.
Pink is considered a color of good health and life - we speak of people being "in the pink" or the "freshness" of a newborn babe.
Lastly, pink is associated with sexuality, and purity. That is, a girl who is a virgin in heart and body. Pink is symbolic of pure love, for example. It is also the color used for sexual advertisements and such, to indicate the purity of the girls.
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