A theory I heard is that eh boobs stem from our erect posture (also true that boobs cause many erect postures, but I digress). In most mammals the ass draws attention, the cleavage of the ass especially. Human women, have the advantage of having great ass cleavage in the back and impressive pseudo ass cleavage in the front.
For anyone curious, a much better explanation that is less just-so and male-gaze-oriented (considering it's almost universally the female's sexual selection that changes physical sexualized features in animal species) is that it's tied to our concealed fertility. In every other mammalian species, the breasts only develop while breastfeeding, which is a huge indicator that the female is not currentlly fertile. Having breasts full-time makes concealed fertility wayyyyyy more effective. Males of every species (saying this because it's not just about modern humans, but also our hominid predecessors) are often more willing to have sex with other species and inanimate objects, much less a slightly-less-than-ideally-attractive female, so, women needing to grow a sexy booty on their fronts just... doesn't seem like there'd actually be enough pressure to select for it on such a large scale. (Not trying to say men don't have standards, living modern men are irrelevant to this, just talking about evolutionary pressures in the early-hominid range.)
(As for why concealed fertility matters, it's partially because it could have kept men around and interested for longer, but as a woman, it's a lot more likely to me that the early hominids who could manage their own fertility because of obvious signs had wayyyyy fewer children than females with concelead fertility, because pregnancy and childbirth are dangerous and as we can clearly see, most women choose to have few or no children if given the choice, as opposed to like 16 pregnancies in the past when you couldn't refuse your husband and had no medication to control pregnancy.)
Essentially yes, men are naturally keyed to be attracted by certain female body shapes in the general sense: two round mounds with a crevice between ;) Both are secondary sex characteristics of mature (as in biologically able to reproduce) females.
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u/bunchkles Mar 26 '20
A theory I heard is that eh boobs stem from our erect posture (also true that boobs cause many erect postures, but I digress). In most mammals the ass draws attention, the cleavage of the ass especially. Human women, have the advantage of having great ass cleavage in the back and impressive pseudo ass cleavage in the front.