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In other, hairier mammals, this process, known as the pilomotor reflex, can produce a layer of insulation.

Not everyone will experience this themselves, but real talk: nips clearly poking out during exercise can be embarrassing, and not to mention, distracting for others if they notice and trust me, you will now.

's rouged nipple is tweaked by her sister, the Duchess of Villars, circa 1600.

Lipstick, as close to blood red as possible, was expressly invented- millennia ago- so that the lips on a woman's face, surrounding one orifice, to advertise sex, not only to remind us of the labia surrounding the other orifice, but, with blood red color, to recall labia that were swollen, engorged with blood, a primary arousal signal.

In a world obsessed with the goodies between your legs, it's easy to forget about the major above your waist: your nipples.

Both stimulate the release of the hormone oxytocin, which triggers the pilomotor reflex.

Drawing your nipple into their mouth will stimulate extra blood flow and increase sensitivity.

For us guys all that happens is that we get hard boner and our penis will start producing and dropping some sort of oily substance.

After you've left an aroused state, it's more than likely that your nipples will return to their usual length.