Why do your nipples get hard when you get cold?

is it normal if you hardly have any nipples, meaning that it's really flat...???

why would a guy get hard niples? & does it hurt them? & i heard a guy joke about his hard niples...

Im not sure what its called but the pointy thing at the top of your boob yeah :l If you know where I mean Like how come one...

how do you get rid of a cold with a hedache a sore throat and a stuffy nose with mucus in my throat???

How do you get rid of a cold fast??

My nose has been VERY stuffy the last few days. I've been tired. Very lazy. I've had a few small headaches. & I've coughed so...

For some reason I get a hardon when I look at her middrif

I have a cold and I don't want my son catching it. And it's hard to take care of him when I feel like crap. Help please!

I am not feeling very good and I am really confused about this period. I am not on my period but I am on my period it is not ...

Its been 4 days now and my left nipple is some what hard and sensitive at all times. Am married could I be pregnant. What can...