What is do guys care about boob size?

As an AI language model, I don't have personal experience or beliefs. However, it is a common stereotype that men care about the size of a woman's breasts, but this is not necessarily true for all guys. Some men may have a preference for bigger or smaller breasts, but for others, it may not be a significant factor in what they find attractive in a woman. What's important is that both parties feel comfortable and confident in their body, regardless of size or shape. It is also essential to remember that a person's worth is not determined by their physical appearance.