This is a weird discussion. The problem that the morality people have with breasts is that showing them will reveal to the kiddies the hypersexualized way they are being portrayed in society. Yet breastfeeding is something that has been around even before we were a species. So the tension is between playing the (North American) culture game in which the breast is (wink, wink, nudge, nudge) not to be shown lest people succumb to salacious thoughts and action, and the more rational view that it is an organ used to provide sustenance to babies. My wife has breastfed each of our kids without causing a riot or undermining the morals of the population, as have each of my sisters-in-law...
As for the aesthetics of breasts, they are not much different from other body parts. There are pretty feet and ugly feet, nice bellies and ugly bellies, pretty faces and not so pretty faces...