Can someone offer a good, justified argument for why men can be topless in more public places than women?

For example, all can be topless at home, on nude beaches; women may be “topless” in public when breast-feeding (kind of), and so on. But I’m looking to see if there’s not a double-standard that allows men to be topless but not women in more places. If so, what are good reasons for creating laws around women being topless but not men.

I’ll offer some thoughts after, but I’d really like either links or original arguments. I can’t find any that are satisfactory (or perhaps my Googling abilities are not as high as yours).

Remember: I’m not looking for descriptive reasons (it exists because people will be offended). I’m looking for justified arguments that will make me and anyone else agree (it exists because topless women give people heart attacks).