This idea among Christian Evangelicals and others that men and women cannot be platonic friends is, quite frankly, a reflection of precisely how sexually repressed and preoccupied conservatives tend to be. I have had female friends throughout my life and have never been sexual with any of them, nor have I felt tempted to be. People who are so sexually driven that they find it necessary to turn every member of the gender to which they are attracted into a potential sex partner need treatment, not more hard and fast (no pun intended) rules which further repress, and in turn further compel them to act out on, their sexuality.