Okay, no crackpot jokers over this one. The nipples fold in on itself to warm it back up. Once they are warmed up the looser formation occurs. The blood is rushed to it to help warm it up. Rubbing them can help them to warm up. Wearing layered clothing is the best bet however to prevent the "annoying, embarrassing," problem.
Nipples can get sore due to cold weather.
No. Nipples will harden as a reflex when they are stimulated or cold.
Genetics,,, I once had A girlfriend that had nipples that were undetectable without your eyes.
Your cold, have weird nipples or your turning into a warewolf ;)
Its cold!
your nipples often swell up when you are cold, and often tickling them helps
Becuz were cold!! =p
because your in the freezer! look around you!
The rings around your nipples are what change in colour and are due to the changes in the hormones that your body is creating.
Everyone is different. When you are young your nipples may be hard a lot of the time. As you get older your nipples tend to become hard only when you are cold, wet or sexually aroused.
TWEAK UM! When a woman is aroused her nipples harden. OR you could always turn down the heat cold nipples=hard nipples
Your nipples are probably not "sucked in", but simply inverted. Some people's nipples are just naturally this way, and is not harmful or bad in any way. Everyone's breasts and nipples vary wildly, despite what you see in the media. Inverted nipples are not normally an issue for breastfeeding or anything else. Surgery is possible to change the shape and protrusion.