How much cleavage do guys need to see to get aroused?

I’ve heard from a lot of guys that all it takes is for them to see even so much as a hint of a woman’s cleavage to catch their attention and turn them on. Is that true? How much do you need to see to a) take notice of it, and b) become aroused by it, if you do at all? Can it just be a bit of cleavage, or do her breasts pretty much have to be almost on full display and popping out of her clothes?
This is not me, by the way.
This is not me, by the way.
How much cleavage do guys need to see to get aroused?
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