Why do nipples harden?!


Question: What is the point of them being hard, for example, when it is cold.
Answers:
well i no that when a girl has a baby they need somthing hard for the baby to bite...the baby wouldnt be able to bite soft nipples..i dont no why they get hard when their cold though

Other Answers:
cause of the nerves. :]

Answers:

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