The tendency for the strongest physical female fighter in a group or cast to also have the largest breasts. Some of the reasons for this trope are discussed on the Analysis page. A physically strong female without Boobs of Steel is most likely a Cute Bruiser. Note that this trope is not common enough to list aversions. Unless it is lampshaded, it is just an ignored trope. Also note that in general, this is limited to one or two examples per work. Not related to Balls of Steel, which is about being immune to a Groin Attack. Compare and contrast with Most Common Superpower. See also Amazonian Beauty for when a muscular female is portrayed as attractive and Buxom Beauty Standard for when having larger breasts is portrayed as attractive.