Thinking that is a great advantage, being able to easily seduce men and thereby choose a suitable partner for themselves, but no, this is a suffering - a suffering that directly affects the future of girls later on, the girl in the movie is a witness to that.
Because of having such big breasts and wearing revealing clothes, easily revealing sensitive parts of the body, lustful men cannot control their emotions, so they make a very wrong decision: raping girls with big breasts.
That shows, sometimes anything too big is not good, sometimes small things give us a sense of security.
