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I understand liking butts, just not those butts.It's a womanly physique, what's there not to understand? Our species has sexual dimorphism.
That's equivalent to saying, "what's the fascination with breasts?"
Although humans exhibit low levels of sexual dimorphism compared to other animals, differences between females and males are numerous. Evolutionary, sexually dimorphic traits develop through the process of sexual selection.
And breasts are the superior female dimorphic trait.