why do

[legend_mark3]

Why do nipples get bigger in the cold ?

And does this happen to eskimos or are their bodies acclimatised to the cold after centuries ?

[4getmenot]

We have special muscular cells within our skin (in the dermis) called myocytes. They're the same that form some of our larger muscles (of the smooth or involuntary muscle type), but in this area they are isolated, and arranged in sort of a circle around the nipple.
Now, when skin muscle cells contract, they cause the skin they're attached to to "fold" because they get shorter.
In the case of nipples, the arrangement of the myocytes causes them to become hard; it's the equivalent of the goosebumps that appear in other areas of our bodies, when the dermal muscles associated with our hair contract.
Contraction of these muscle cells may be triggered by different stimuli: touch (pressure), cold (temperature), or sexual excitement ('orders' from the brain).

[legend_mark3]

Very good copy n paste 4get .
Now regarding eskimos nipples ?

Any information ?

[4getmenot]

why thank you all you had to do was look on google like I did, and I dont know ask an eskimo. but I would have thought they do if they were climatised to the cold then they wouldn�t need to wear all them clothes that they wear would they

[Octavius]

In respect of temperature, as eloquently detailed by 4get, the nipples react to a change in temperature. Whilst the Inuit people may be more hardened to bearing the extremes of temperature for prolonged periods, they are quite likely to have the same reactions to us when faced with a fair degree of instantaneous temperature change.