if you consider that such a large and chubby organ would be disadvantageous for surviving, how do you explain the evolution of sumptuous female breasts?
i think most of you think that this is associated with breastfeeding. but many mammals breastfeed too, but they don't have such large organs, right?
what is the deal with those nice breasts? can you figure out what is going on?
There is definitely some severe debate going on concerning this issue. Some have proposed women have prominent breasts as the result of natural or sexual selection. Suggesting since women with large breasts are considered more desirable they would have more suitors and as a result reproduce more often.
Others argue that this concept myopic because its based solely on modern Western society's ideals of what is considered attractive. Those folks would suggest that breast size has seldom been of major importance in most societies. In the majority of societies breasts are just a source of nourishment for infants and young children.
Whereas there is a relatively important argument against the latter argument in favor of the former. It would be difficult to believe that there is some "natural selection" root for the "modern western society" propensity of finding women with large breasts attractive. It would seem unlikely that these sorts of pervasive ideals toward the female form would simply appear out of thin air - that's giving Playboy a lot of credit I think.
Then minimalistic view of why female breasts become so prominant is that the development of the female breast during puberty is likely the side affect of some biological necessity that is not readily apparent. Perhaps it is simply that human females experience a greater increase in estrogen levels during puberty than do other mammals.
I do have to admit that I like the theory mentioned above about the need for larger to prevent suffocation while breast feeding, however, I would reckon that a major contribution to increased breast size may be the increased fatty content of our diet. This may be an explanation for why past cultures didn't have an affinity toward large breasts, because of the lack of high fat content in their diet, there were few women who displayed large breasts. However, because diet was usually a representation of status, there were many female members of aristocratic classes throughout time who were viewed as the most beautiful women of their day. These women tended to be rather Rubenesque. So, maybe it was already engrained in the human race early on.
So, it's not well known the mechanism by which female breasts have become more prominent in comparison to other mammals. Which leads me once again to my soap box: When it comes to biology/evolution, it's impossible to answer much of anything when it comes to "why." Things happen for reasons, but very little of - if any - biology happens for a reason. Breasts aren't more prominent in the human species when compared to other mammalian species because of any designed reason. It could be that women with bigger breasts are more likely to mate, or mate more often, than women with smaller breasts, maybe it is our diet, whatever the reason that allows for breast sizes to increase, the genetics that allow for this to happen was determined by hundreds of the thousands - if not millions - of years of selective pressures that selected these genes as the most fit. These pressures have altered and molded these genes to their current status.