I've never heard of this myth before and if it were true, I'd be toppling over!
Women's breasts grow at a diff rate per person up to about the age of 21.
I'm sorry I can't be of much more help, but I really do not think this is a very good myth.
Good Luck
hey i heard that too! i heard that when you are having sex the breasts bcome slightly bigger but only while you are doing it?! i didnt believe it though
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