A 2011 study compared men's preferences for breast size, symmetry, and areola size and color in Papua New Guina, Samoa and New Zealand and found that men from Papua New Guinea preferred larger breasts than men from the other two islands. Įven if there is some biological underpinning for an interest in bosoms, it might vary by culture. We can learn to prefer large breasts,' Dettwyler wrote. We can learn to prefer long, pendulous breasts, or upright, hemispherical breasts. 'Obviously, humans can learn to view breasts as sexually attractive. In the cultural view, men aren't so much biologically drawn to breasts as trained from an early age to find them erotic. 'In any case, they regarded it as unnatural, perverted behavior, and found it difficult to believe that men would become sexually aroused by women's breasts, or that women would find such activities pleasurable,' Dettwyler wrote.

In a chapter in the book 'Breastfeeding: Biocultural Perspectives' (Aldine de Gruyter, 1995), cultural anthropologist Katherine Dettwyler describes telling friends in Mali about sexual foreplay involving breasts and getting responses ranging from 'bemused to horrified.' Thirteen cultures also reported breast simulation during sex, but only three of those overlapped with the societies where men reported finding breasts important for sexual attraction. Another two - the Maasai of Africa and Manus of the South Pacific - liked breasts that were upright and 'hemispherical,' but not necessarily large. Two - the Azande and Ganda of Africa - found long, pendulous breasts most attractive. Of those, nine cultures preferred large breasts. In a 1951 study of 191 cultures, anthropologist Clellan Ford and ethologist Frank Beach reported that breasts were considered sexually important to men in 13 of those cultures. For one thing, it's not actually clear that breasts are universally adored. īut there are pitfalls to this line of work. In this hypothesis, it wasn't just the female breast that got a lift men acquired relatively large penises for their body size, too. Anthropologist Owen Lovejoy argued that evolution put a bull's-eye around both female and male reproductive organs in order to promote pair bonding. Researchers have long speculated that humans evolved the fatty deposits around the female mammary glands for sexual reasons. 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.

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. Mammary glands are a defining feature of mammals, but humans seem unique in granting mammaries a large sexual role.

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