Larry Young, a professor of psychiatry at Emory University who studies the neurological basis of complex social behaviors, thinks human evolution has harnessed an ancient neural circuit that originally evolved to strengthen the mother-infant bond during br'east-feeding, and now uses this brain circuitry to strengthen the bond between couples as well. The result? Men, like babies, love br'easts.
When a woman's ni'pples are stimulated during br'east-feeding, the neurochemical oxytocin, otherwise known as the"love drug,"floods her brain, helping to focus her attention and affection on her baby. But research over the past few years has shown that in humans, this circuitry isn't reserved for exclusive use by infants.
Recent studies have found that ni'pple stimulation enhances se'xual arousal in the great majority of women, and it activates the same brain areas as vag'inal and clitoral stimulation. When a se'xual partner touches, massages or ni'bbles a woman's br'easts, Young said, this triggers the release of oxytocin in the woman's brain, just like what happens when a baby nurses. But in this context, the oxytocin focuses the woman's attention on her se'xual partner, strengthening her desire to bond with this person.
In other words, men can make themselves more desirable by stimulating a woman's br'easts during foreplay and se'x. Evolution has, in a sense, made men want to do this.
Attraction to br'easts"is a brain organization effect that occurs in straight males when they go through puberty,"Young told Life's Little Mysteries."Evolution has selected for this brain organization in men that makes them attracted to the br'easts in a se'xual context, because the outcome is that it activates the female bonding circuit, making women feel more bonded with him. It's a behavior that males have evolved in order to stimulate the female's maternal bonding circuitry."Why Do Men Have Ni'pples
So, why did this evolutionary change happen in humans, and not in other br'east-feeding mammals? Young thinks it's because we form monogamous relationships, whereas 97 percent of mammals do not."Secondly, it might have to do with the fact that we are upright and have face-to-face se'x, which provides more opportunity for ni'pple stimulation during se'x. In monogamous voles, for example, the ni'pples are hanging toward the ground and the voles mate from behind, so this didn't evolve,"he said."So, maybe the nature of our se'xuality has allowed greater access to the br'easts."Attraction to br'easts"is a brain organization effect that occurs in straight males when they go through puberty,"Young told Life's Little Mysteries."Evolution has selected for this brain organization in men that makes them attracted to the br'easts in a se'xual context, because the outcome is that it activates the female bonding circuit, making women feel more bonded with him. It's a behavior that males have evolved in order to stimulate the female's maternal bonding circuitry.
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