This article in The Economist, The Science of Love, is fascinating. It does give a little more ink to voles than I find sexy, but it hits a lot of points.

• Evolutionary psychology vs. Behavioral Genetics (universals vs. variation).
• Various forms of "love" (lust, romantic love and long-term attachment).
• Similarities of some forms of love to deleterious phenotypes (manic depression) & drug addiction.
• Implications of various forms of love for human societies.

Sometimes I wonder of modern Western society tends to idealize the more "manic" form of love than is healthy. Ah...but it feels so gggooooooddd....