This has come up many times on CAF. So by this point, after having read tons of posts and referred articles, I feel fairly confident in saying that your assertion that “breasts are not inherently sexual” is contrary to both biological, anthropological, and even current psychological evidence.
Humans are are the only primates with perennial breasts. Other female primates do not have noticeable breasts unless nursing. Further, human breasts are far from optimized for breast feeding. In fact, the rounder shape of the human breast is the least conducive for a child to feed from among all primates. The more angular shape of other primates reduces the risk of blocking a child’s nose while nursing. The fat deposits that make women’s more rounded, permanent breasts do, however help to naturally attract males. If you look at even the most ancient primitive art, large, rounded breasts are prominent in fertility symbols, not angular teats. Further, evidence supports that “breast play” as a form of foreplay or intimacy is present in most cultures all over the world, and has been in history.
Much more can be said, and if you are interested, just look up “permanent breasts” + “humans” or “secondary sex characteristics” + “humans”. There’s tons of material online on the subject.