http://www.collegehumor.com/embed/6666713/can-men-and-women-be-friends-survey

Notice how all of the women say yes, without even hesitating, while the men only say yes with extreme reluctance. The women then openly admit that they know their male friends want more than just "friendship" from them. Although College Humor is usually a place for comedy, it reinforces the fact that men and women simply can't be "just friends".