Personally, I think there is pure friendship between boys and girls. Why do you say that? Because the friends of the opposite sex around me have no idea about me, we are completely clear.
even if I have thoughts about them, they won't have thoughts about me, so I can draw a conclusion here that those impure friendships often happen to those with higher face value. People with lower face value like me are almost friends with the opposite sex, so there is no other possibility.
If you take a closer look at this truth, I'll give you an example to illustrate it. You are a man. Now there are two women in front of you, one is Hua Hua and the other is Dilraba. If you had to choose to make friends with one of them, or even be a confidant, who would you choose?
I think as long as a slightly normal man will choose Dilraba, which shows that there is no problem with his aesthetics, and his purpose of choosing Dilraba may be a little impure. Why not choose without flowers? Because he is ugly, because he is ugly, it is absolutely impossible for two people to have a little nasty thoughts, and even thinking about it in that way will make people feel nauseous. The result is obvious, and most of the opposite sex around those ugly people are good with him.
I especially don't like some confidantes and confidantes nowadays. It's these confidantes that are really problematic. Do you think it can be used as their fig leaf to put a simple label of confidante on those who are having an affair? How many blue confidants take advantage of other couples' quarrels and go directly to the upper level, so blue confidants often turn green when they are blue.
To sum up, there is definitely pure friendship between boys and girls, but it depends on the face value of two people. The more attractive a person is, the more innocent the opposite sex around him is.