Why can't men and women sleep together and have sex? What's the reason? What's the matter?

1, it should be that you have no feelings for each other. You are not the person he or she wants. She (he) doesn't want two people to get entangled after having sex.

2. She (he) thinks that two people are true friends of the opposite sex, the kind without color, and is unwilling to destroy this pure friendship.

I am too timid to do it.

4. Physical and physiological reasons are also possible.