Boxers and other hand-to-hand fighters sometimes get "cauliflower ear", which is referred, medically speaking, as "auricular hematoma." It's a deformity that results most commonly from getting punched in the ear.
So a guy with cauliflower ears looks like someone who's been in some hard fights and is ready for more. From a particular point of view, it contributes to an aesthetically appealing appearance.
Oddity Central reports that some men in Russia are getting cauliflower ears not the hard way, but through cosmetic surgery. When matched with a muscular physique and a confident demeanor, they convey an overall impression of physical dominance.
Perhaps women find this look attractive.
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