Why do our nipples coalesce at times?
Answers: Hardening of the nipples above all has to do near the numerous tiny stripes of muscles arranged within the skin beneath the areole (the brown circle surrounding the nipple bud). When aroused or cold, the muscle fibers contract. They mete out changing of the size and shape of the nouns around the nipple, hardening and elevating of the center (the bud) and rising of goosebumps adjectives over the breast.
The little bumps on the areole are elevated openings of the glands that surround the nipple. When muscles contract, they trademark an attempt to release the fluid each gland have produced, and so the areole appears bumpy.
The goosebumps on the skin of the breast (and everywhere else on the body) are caused by the tiny muscles arranged beside respectively and every hair. Their contraction elevate and straightens the hairs on our skin.
because it mkes us aroused and it cause th nipplels to get sturdy its just a girl article cause the skin is so sensitive nearby.
Blood flow.
When they are cold more blood flows to them to warm them, when you are excited more blood flows to them. Nipples r merely like God endowment. It is very sensitive. It communicate the love also, for the two generation..i.e. father and the child. It responds to the foreplay.
The other reason is that , what enjoy written...cold or shivering.
nipples are much the same as your penis ( perchance not ur penis, lol), when you are aroused the blood vessels and backbone endings respond by pumping blood into the region, cause them to become erect. when you are cold the same motion happens. to reheat the area, as a previous poster said its adjectives blood flow.