What's there not to like? They bounce. They look cool. They're warm. They respond to touch. They give me something to pay attention to during a conversation
. (I know... I know... I should start expecting angry PM's for that. It's a joke. Chill.)
However, taking this more seriously, I'd like to put out an idea from
The Naked Ape. Basic primates often present themselves to a more dominant individual by essentially turning themselves around and presenting their ass for mounting. Not only is this a dominance thing, but it allows for the sexual gratification of the individual.
However, as humans, our stance is more upright and does not lend itself to the presentation of buttocks as a sexual symbol in the same fashion. We're more suited to present ourselves facing another individual, with the front of our bodies facing them instead of the back. If you'll notice, our species is the only primate with hemispherical breasts, quite possibly adapted as such to retain the sexual symbolism in the female.
This, partnered with the fact that humans are also the only primates with outturned, brightly colored lips (like I have to describe what it is those're supposed to have adapted to look like) could account for why breasts are so awesome. If that's the case, they're amazing on a level that's very basic to us as primates; and not inherently in a male-female sexual sense, as the presentation and mounting are done by lower primates just as often in a dominant-submissive sense as they are in a sexual one.
Just a thought. Even if that's the case, they're clearly awesome on many more levels than just a basic one. Take this one woman I know, for example...