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We can learn to prefer large breasts," Dettwyler wrote.[The 7 Biggest Mysteries of the Human Body]Even if there is some biological underpinning for an interest in bosoms, it might vary by culture.According to Young, the theory "just makes a lot of sense." Young elaborated on the theory in his book, "The Chemistry Between Us" (Current Hardcover, 2012), co-authored by Brian Alexander.Attraction to breasts "is a brain organization effect that occurs in straight males when they go through puberty," Young told Live Science.That's not to say interest in nipples is entirely unheard of elsewhere in the animal kingdom: In the book "Biological Exuberance: Animal Homosexuality and Natural Diversity" (Stonewall Inn Editions, 1999), Canadian biologist Bruce Bagemihl notes that a couple of primate species, including humanity's close relative the bonobo, have been seen stimulating their own nipples while masturbating.Still, few mammals other than humans mate face-to-face (the behavior makes headlines when seen in the wild), so nipple stimulation isn't generally part of the script.

But in this context, the oxytocin focuses the woman's attention on her sexual partner, strengthening her desire to bond with this person.

In other words, men can make themselves more desirable by stimulating a woman's breasts during foreplay and sex.

Evolution has, in a sense, made men want to do this.

In monogamous voles, for example, the nipples are hanging toward the ground and the voles mate from behind, so this didn't evolve," he said.

"So, maybe the nature of our sexuality has allowed greater access to the breasts."Young said competing theories of men's breast fixation don't stand up to scrutiny.

Researchers have long speculated that humans evolved the fatty deposits around the female mammary glands for sexual reasons.