Guys, When does a girl start becoming attractive to guys?

im really curious, like is it when she starts developing? What is it that makes her attractive when that happens? x

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* i don’t mean your age I mean, when do girls actually become sexually attractive to you? Is it when she develops curves? I don’t know what it’s like to be a guy so im just curious I guess
Guys, When does a girl start becoming attractive to guys?
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