Female breasts are sexual organs because women can orgasm from having their nipples played with. This doesn't happen in men.
Breasts are erogenous zones for both men and women. If you’re arguing based on that post that included the idea that if someone claims that breasts are not sexual organs and that it is okay to go up and grab them without their consent, then you are CLEARLY missing the point of the arguments against the OP.
The primary biological purpose of breasts is to FEED CHILDREN. The whole point of fighting against the whole sexualization of women’s breasts is so that women can breastfeed in public. So that they can FEED THEIR CHILDREN. Not so men or women can stare at them in any sort of sexual way in public. All women want to do is to be able to feed their children without having to deal with unwanted sexualization of their bodies.
Also:
Male and female (non-pregnant) nipple stimulation has been claimed to induce prolactin secretion… Young adult women and men report that breast stimulation not only induces their sexual arousal but enhances it when already aroused.
And guess what? Other areas of the body can be massaged or “played with” to induce orgasm. Not just breasts. And not all breasts, in both men and women, do have the sensitivity to stimulation, given that all female breasts, regardless of size have the same amount of nerve endings, making larger breasts a lot less sensitive.