I can understand why so many women and men can't be 'just friends'. The animal instinct is strong and one needs a lot of practise of mind control or some lucky/great experiences in order to sustain the animal instinct from taking over because 'just friends' means no sexual vibe from either side.
But there are emotionally stable people out there, sexually as well, and those individuals can have friends from the opposite sex because they can separate the animal instincts from interviening humane behavior. But these people are usually assasinated or silenced and you almost never meet one, but when you do, it's a relieving experience.