Lefty, I have to disagree with you this. I don't think that the appeal of physical attraction ever diminishes - we just work out that there's... more, that it's not the be-all and end-all. Certainly I wouldn't want to believe I'd ever stop appreciating beauty when I see it.
Nevertheless, when you meet someone new, what you see is often the most significant factor in making your *first* impressions, whether it's the smile of the bum or the eyes or the whole package, simply because it's the first bit of information you receive and process. Maybe you saw someone's pics online; maybe your eyes met across a crowded room; vision is just... longer range than your other senses, and so it gets the first shot and everything else is playing catch-up thereafter. I'm inclined to think one of the only common exceptions to that is forums such as this, where you're likely to read someone's posts first.
Also, apologies for the threadjack - Mod, feel free to put this in a thread of its own if appropriate...