Some people believe in such friendship. Others are sure that it is impossible. Everything depends on people.
They say that women and men can be just friends if they follow certain rules. And it depends on the situation. For example, if a person isn't married, it is ok to have friends of the opposite sex. You see, it is almost inevitable. The fact is that nowadays women and men go to school together, work together. So, they make friends with each other.
Things are absolutely different if a person is married. In this situation you compare your friend of the opposite sex with your partner. And it can lead to serious problems.
Of course, it's up to you to believe in friendship between men and women or not. However, I think that such friendship is possible as long as people maintain proper borders.