Scientists have never satisfactorily explained the peculiar locking of men by women's breasts, but now, a neuroscientist has launched an explanation, he said, "does this make much sense."

Larry Young, a professor of psychiatry at Emory University who studies the neural bases of complex social behaviors, believes that human evolution has taken an ancient neural circuit that originally was developed to strengthen the bond between mother and child during breastfeeding to strengthen the bond between partners. The result? Men, like babies, love female breasts.

When women's nipples are stimulated during breastfeeding, oxytocin, also known as the "love drug", flooded his brain, which helps to focus your attention and affection towards the baby. But recent research has shown that in humans, this circuit is not reserved exclusively for children.

Nipple stimulation increases sexual arousal in the vast majority of women and activates the same brain areas that vaginal or clitoral stimulation. When the couple juggles or massaged the breasts of women, during the preliminaries, triggers the release of oxytocin in the brain of women, just like when the baby feeds. But in this context, oxytocin focuses on women in their partners, enhancing their desire to connect with her.

In other words, men may be more desirable by stimulating a woman's breasts during foreplay, and evolution has been, in a sense, who has made men want to do this.

The attraction to female breasts "is an effect of the organization of the brain that occurs in heterosexual men when they reach puberty," says Young. "Evolution has selected this brain organization for men to be attracted to the breasts in a sexual context, because the result is that it activates the circuit connecting with women, so that women feel more attached to their partner.'s a behavior that has evolved in men to stimulate circuits "maternal attachment" in women ".

So, why this evolutionary change occurs in humans, and other mammals also breastfeed? Young thinks it is because of our monogamous relationships that do not occur in 97% of the mammals. "Second, you may have to do with the fact that we are in an upright position which offers more opportunities nipple stimulation during intercourse. Monogamous In mice, for example, the nipples are hanging to the ground and mate from behind, preventing this kind of evolution. "

But this theory of Young will face some criticism. Commenting on this theory with Fran Mascia-Lees anthropologist from Rutgers University, who has written extensively on the evolutionary role of breasts, said a first issue is that not all men are attracted to them. "It is always important when evolutionary biologists suggest a universal reason for a behavior or emotion: What about cultural differences" Mascia-Lees wonders. In some African cultures, for example, women do not cover their breasts and men do not seem to find them, so to speak, exciting.

Picture By Melimama [CC-BY-SA-2.0], via Wikimedia Commons