One criticism of much psychological science is that it focuses on a population that may not be broadly representative but is readily available to the researchers--undergrads. I think that has some merit, and rarely more so than in this piece at Scientific American: "Men and Women Can't Be 'Just Friends'." It seems the men and women had very different views as to whether there was a possibility of romance in their platonic friendships. Population studied: "88 pairs of undergraduate opposite-sex friends." Please.