Here's some research that confirms my own empirical experience--that people become more (or less) physically attractive to you the better you get to know them, depending on other aspects. I've noticed that women to whom I woudn't necessarily have given a second glance upon first exposure become quite physically appealing over time and repeated exposure, if they have other desirable characteristics--they "grow on you," as the old expression goes (for me, intelligence is a key enhancer).

This is probably a useful evolutionary trait, assuming that monogamy is a useful evolutionary trait.

EtOH has the same effect.

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