Human females have relatively large breasts, whereas other primate females do not. One hypothesis is that large breasts developed to resemble buttocks. Given that face-to-face sex is desirable in reinforcing emotional bonds and that males prefer the buttocks (both questionable assumptions), large breasts would serve to attract human males to the female's front." (Relethford, John H. The Human Species. Mountain View, California: Mayfield Publishing Company, 2000. pp. 242.)
And here's something for those of you who have been placed in the position of having to insist that we really do read the articles ;-)
from http://www.playboy.com/sex/features/breasts
"In The Naked Ape, zoologist Desmond Morris outlines his idea that men love boobs because boobs resemble buttocks. In the jungle a female primate in heat displays her ass to indicate that she's ready for sex. ( a naughty bit snip ) Morris surmises that once women began walking upright, breasts developed as a way for them to arouse bootylicious thoughts without bending over. Biped babes could now catch a male's eye coming or going. The problem with this hypothesis is that men in many cultures aren't obsessed with breasts. In their 1951 book Patterns of Sexual Behavior, anthropologists Clellan Ford and Frank Beach conclude that the most universally admired female trait is plumpness. Less than one quarter of the tribes they surveyed valued large breasts. The website 007b.com, which archives the various sizes and shapes of breasts (including tubular), argues that they are not inherently sexy but simply a sign that a girl has become "capable of feeding children as God intended." It asks, "Is a bull interested in the cow's udder when it wants to mate?"
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Gary Williams
<a href="http://mycos.blogspot.com/">Mycos</a>