I'm a guy, and women's breasts will never not be sexual to me. They are the most arousing part of the female body to me. So the whole "they aren't sexual" thing is never going to fly. I'm sure you could find women who admit to being sexually aroused by a man's bare chest, so I don't see what that has to do with anything anyway.

The simple fact is, women should be absolutely free to put their bare chest on public display as long as men are allowed to do so. I've been to a lot of places in the world where women going topless is legal, and have only ever seen publicly topless women in places where it is not. My experience tells me legalizing it isn't going to cause hordes of loose women to roam the streets looking to corrupt little Johnny. But that's what the prudes are worried about.