Why are there still fears over nudity?

There’s been a lot of morality questions today, and the boobatar war question kind of puts them in the same boat. Why are male nipples acceptable but a woman’s not? essentially the same thing(beleive it or not men CAN lactate) Why is nudity still frowned upon? As human beings I think it’s safe to say we all see one or the other set of naughty parts on a daily basis, and we’re all aware that the other exists and what they look like. So I ask, is it logical to frown upon nudity?