The size invariant desirability is supported by non-correlation of size and substance, fibroglandularly speaking, by xray. But this assume desirablilty is based on productive capacity, which is a guess.
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Aside from a pleasing shape, perhaps recognizing a primordial nutrition/survival source subconsciously signals attraction. IDK
Men with developed pecs would not check that box, though, unless the subliminal suggestion of strength implies the ability to hunt food.