Breasts with a noticeable upward "perk". This tag is generally used for breasts that turn upward naturally rather than with the aid of a push-up bra. Also known as the 45:55 ratio or "beckoning breasts" as coined by Patrick Mallucci, who led a large research study into what defines an attractive breast.
For breasts that are the opposite of perky, see sagging breasts.
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