People claim full support for gender equality, etc. At the same time, they find it OK to ban female nipples (but not male nipples), also it's not OK to not wear a bra in offices, etc. Horrible.
We are coy about the parts of human anatomy involved in child creation and care, especially those that change with puberty. People are sexually interested in female breasts from an "ultimate cause" perspective because they feed babies, and grow when a woman is sexually mature. I'm not saying that they should be covered up; but I don't buy the argument that there's no difference between male and female breasts.
In particular these restrictions are broadly a cultural thing rather than innate and part of the taboo about being naked in some cultures is because they sexualize some body parts to the point of fetish. This isn't universally true, even historically within cultures where it is true now and is often lopsided based on power relationships. For example women often bear the brunt of more restrictive dress codes because they stem from patriarchal societies.