Attachment and dependence is only important for as long as it takes to reproduce, and a few more years of raising the kid :p, after that, it wouldn't matter too much if it started to fade, evolutionary speaking :p. Also, the attachment part is more distinct in females than males. Regardless, humans are far less polygamous than the vast majority of species on this planet. I think only 3% of the species on earth are known to mate for life, and most of them have that attachment formula in them. It's hard for me to go into the specifics of it, because it was a documentary on National Geographic, not somewhere on the internet. I'll download it as soon as I find it though, and then I'll be able to give a few more details.
I didn't mean to say that physical attraction is the same as love. What I meant is that the chemicals released when we are physically attracted to someone, can eventually trigger the chemicals that make us feel "in love". The wonderful feeling you get when you're head over heels in love with someone are actually huge releases of dopamine in your brain.
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