Anyway, the darker colour of your nipples and areola is all down to your hormones. During puberty, the flood of oestrogen and testosterone causes the body to produce more melanin (the pigment that gives you everything from your hair colour to your freckles). This is also why the penis and labia darken during puberty, and it is even why many fair-haired children grow up to be brunettes. The likelihood is that this is just another one of those things that signals to any potential mates that you're up for a little bit of procreation. The darkening of the skin would be a clear signal that the individual is reaching sexual maturity and is capable of having lots of sex and babies. This is, after all, what it's all about, evolutionarily speaking.As a general rule, when there's a strong genetic trait involved, it's probably got something to do with bonking.
