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It's really tough to know for sure, but it could be a genetic or societal thing (nature vs nuture). Most guys tend to like larger breasts no matter what part of the world they are from, so it probably isn't a societal thing. Instead, it is probably encoded in some gene that drives brain development during puberty that goes along with guys liking everything else about girls. So, if it's genetic, then why? Most issues such as this are resolved by thinking in an evolutionary context. That is to say, is there something about guys liking large breasts that makes their offspring survive more? Well, maybe! One hypothesis would be that large breasts make more milk, so if a guy mates with a girl who has large breasts, the chance of his child survivng (by having better nutrition) and passing on his genes of liking large breast will be increased. However, most people say there is no known correlation (although that is a way of saying we aren't completely sure, but there's not a huge difference), but it could still matter. Also, women's breasts tend to swell when they produce milk. So, a guy saying, "Wow, nice breasts," could really mean "Wow, your breasts are swollen with milk and if I had a child with you then you could provide him/her with great nutrition to make him/her survive." Another idea would be that breasts tend to develop as women go through puberty. Therefore, before societal conventions prevented it, liking girls with larger breasts could stop them from trying to mate with a very young girl who was either not sexually mature (and could not bear a child) or unable to properly care for a child (because they do not know the ways of the world yet). This way they wouldn't waste their time pursuing someone who wouldn't have children if they mated or someone who couldn't raise a child properly. I am sure you can think of other reasons that guys liking large breasts would help them have more offspring that survive, but the general idea of passing on genes to as many offspring as possible is probably correct. One note is that even girls with small breasts can produce plenty of milk, and, perhaps not surprisingly, breast size is not a deal breaker for most guys. Instead, it is just a secondary factor that guys tend to think about.

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17y ago

What else can I help you with?