[Twosugars]

I think that although we like to think of ourselves as rational beings, a lot of our behaviour is driven by primal instincts, e.g. our reproductive behaviour. Each sex tries to impress however they can. In humans, female of the species is more decorative and wears "colourfull plumage". But men are not immune from that either. It's getting more equal on that front lately (men are more body conscious & strive for perfection in their looks - que quest for six pack, steroid use, insecurity, etc).
Sorry to be ellitist, but it seems to me, people with less education or intelligence, tend to follow the crudest ideals of beauty e.g. some women trying to look like blowup dolls or porn actresses through plastic surgery. I guess in men the equivalent would be also plastic surgery and steroid pumped muscles.
Re. cock size, like it or not, studies and anecdotal evidence shows that, given a choice, women prefer a bigger one.
I'm generalizing for the sake of argument of course. Majority of people avoid these superficial extremes and prefer other, more sophisticated means of wooing a partner or not giving a sh*t (or say they do).