Wow, we've gotten into some
Wow, we've gotten into some deep territory here: eroticization (the cultural process of labeling parts as sexual), sexual selection (one of the most powerful forces in the evolution of animals), and the ascendency of geek sexiness (no fancy word for that yet).
It's hard to know how much evolutionary forces are still working among humanity, because everything we do is covered in such a thick layer of culture. There is so much coded signalling about sexuality and status going on (like with the skinny jeans, to name just one of a billion examples), and it's become completely disconnected from actual reproduction. Humans are a completely bizarre species in this sense. Many high-status humans actually decide consciously NOT to have more kids.
Still, I strongly feel that there is a lot of primitive, non-culturally dictated, behavior going on, at least on the level of basic impulses, which thinking and culture later squash -- but not completely.
Men (generalizing here) tend to be attracted to really young, really healthy women. An older guy may not act on his attraction to a 16-year old (that damn stupid culture stopped him) but the impulse is there. Survey the vast sea of porn and you'll see the preponderance of really young women.
Similarly women (generalizing here) have a very elemental attraction to bad boys, yeah, ones that are going to lie and cheat and who are capable of violence. A classic come-on from my single days, which I should have used more because it totally worked: "I don't think we should get together. I'm just going to cheat on you." (Which in my case, sadly, was a lie.
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Of course most men and women eventually come to their senses and get together with someone who actually offers them a future (like the geek!) but there were moments when biology, more than thinking or culture, was driving their attraction. In those moments we are more like apes from a million years ago, worrying about a healthy mate or protection from predators, than the exotic show-dog kind of species we've become today.
I think it's fun to feel the primitive foundation of our existence. The other day I was doing this adventure race and wound up running in a silent pack with 3 or 4 others through some really challenging trails and brush, for at least half an hour. It felt completely familiar to me, like I had done this in another life. (Hunting?) And having minimal shoes was part of that.
On the other hand I love movies and skinny jeans and literary novels and all the rest of this tremendous crust of culture that we've built up on top of our basic biological reality. I wouldn't want to be primitive.
And likewise (to finally get back to the original topic) I don't think I'd want to run without a bra if I had breasts, especially big ones. I ran with a 40-pound water jug in a crosstraining class the other day and the sloshing back and forth of the water was terrible. If having big breasts is anything like that, I say use all the technology you can get your mitts on.