wow! this concept is SO complex, i don't know where to begin! and, really, i don't have the ability to explain it, anyway. i'll just make a few observations.
certainly, babies are born with the ability to recognize the human face - so we feel a resonance with mommie's face and body.
but, i know when i look at either one of those "Greek statues", a painting, or picture, or beautiful live human male, it makes me feel all warm and calm inside.
and i can look for hours and never be bored. sure, it's sexual, but (unlike those puritain losers), i don't see that as a bad thing. i do think we have an innate sense of what is really beautiful - one of the few times I can really be Platonic - and we are naturally drawn to it.
when I make an image, no matter what it is - even if there are NO humans in it - I am trying to create, in some way, what I see as "perfect" or beautiful.
and, even if the subject is "ugly", there can be a kind of beauty in uglyness. strange as that may sound.