Is there a pure friendship between men and women?

Say one of the most realistic problems. When you are sad, sad, angry, annoyed, indecisive, you say you need to find someone to say why you do not find your gay girlfriends? Do you look at the same problem with the same eyesight, would it be better to share the pain and share the pain? You have to find the opposite sex to tell. You want to seek comfort in the opposite sex, virtually the other party as the other half. You say it is because boys and girls look at the problem, the way to deal with things in different ways, perhaps the other side can give you the answer, then this is not a purpose with the opposite sex friends do? With the purpose of friendship, is pure friendship it?