It can happen out of nowhere. There you are, standing in the checkout line at a grocery store, when all of a sudden your nipples become erect. Random nipple hardness is totally normal from time to time. The nerves in the nipple react to stimuli, both physical and psychological.
Nipples are weird and wonderful things; they go hard when you're turned on and stick out like sore thumbs when you're cold - and sometimes, just go hard for no apparent reason. According to the journal of Nature Neuroscience, hard nipples are normally involuntary and are controlled by the sympathetic nervous system, which also coordinates and regulates all our other unconscious bodily functions. The study's co-author Alessando Furlan explained: "We've shown that the sympathetic system consists of many types of neuron that regulate specific functions in the body.
Alexia and I gazed into the distance for a moment, thinking about nipples, sexual arousal and the cold weather, our thoughts playing out in perfect unison When you work as closely as we do, your brains link up. A slip of the nip, and it's deemed " indecent exposure. You know what I want to know? I mean, these gorgeous nipples Yeah, I own it, you troll.