Jesus, dude - my whole point is that exposed breasts shouldn't be equated to porn, and the fact that they are is only a stronger reason to allow them to be free right now, to undo that association as soon as possible. A woman choosing to go out to get her mail without a top on shouldn't be equated to a peep show. A woman choosing to play video games on twitch without a bra shouldn't be equated to a strip show. Yes, the current generation of kids will view it as porn, because they haven't seen it outside of porn, which they have already seen, no doubt. It was so easily accessible on the internet that I'd seen my fair share of it before I was out of elementary school in 2002, and it's only gotten even more prevalent. It's an issue, sure, but to let it be the reason not to allow something that shouldn't be equated to porn in the first place is ridiculous.
If breasts are allowed freely in public spaces, it won't be very long before they stop attracting horny boys any more than well-fitting clothing already does. Again, the effect that breasts currently have on boys is already too much - they shouldn't be making men salivate by simply being exposed - they're just breasts, and those in other cultures that have breasts exposed on a regular basis don't have that issue.