I hope I could explain :/
Most Helpful Guy
It's always more of a distraction. It doesn't influence their attractiveness to me, but I guess if it was a one on one thing and she wears something that shows a bit of cleavage, I'd be more inclined to think that she was interested.
Speaking in terms of nude appearance, unless you have some kind of birth defect or injury that made your collarbone/sternum jank (which would be interesting), the decolletage isn't really on my list of things that make a woman's figure.