speaking of my alma mater...
A recent University of Louisville study (PDF) examined why women are attracted to married men. In a phenomenon dubbed "mate copying," the researchers determined that females tend to be attracted to mates they perceive as having been selected by other females, even if the've been tricked into that perception regarding a male who normally wouldn't offer much appeal (for example, a dull-colored, as opposed to brightly-colored, guppy).
The researchers presented 166 female undergraduates with a report in which five (fictitious) women rated the physical attractiveness of a man, and indicated whether they were interested in dating him. The female students were more likely to express interest in the man if more of the women in report had also done so.*
(via FARK, once again)