I am lucky enough to say that I have a very beautiful girlfriend. The only problem is she is nieve. She thinks that most guys genuinely want to be just her friend. Three examples I have used to try to show her she is wrong are:
1.) her "best friend" from home told some guys that I'm friends with that he had sex with her in high school, which was a total lie and I knew this but the point being her best friend obviously is hoping for a chance to have sex with her.
2.) This kid who randomly got her number, not even from her, will constantly text her and "creep" on her. Her facebook status one day was that she wasn't feeling well and he sent her a bunch of text seeing if she was getting her rest and what she was doing. It was a good excuse to start a conversation. when I asked her why she even responds to him when he text her if he is "creeping" on her, she told me he is a nice guy and could be a possible friend. If the kid wants to be a friend I would think he would be trying to friend me as well, but since he isn't its obvious to me that he is trying to play the just friend card fro now also hoping for his chance.
3.) This third guy is my biggest pain. He constantly flirts in obvious ways. He will say "I wish I was as cute as you" and she will just giggle and like the attention. Being in college they have related classes and will sometimes do homework together. I hate this because I constantly know that he is using it to flirt with her and although I know she wouldn't cheat on me, I wish she would stop this someway because they kid has been looking for ways to break her and I up for some time now so he can get his chance.

I have tried to explain that these kids aren't "just friends" but she feels like I'm just being dumb because she says that not all guys just want sex and some really just want to be friends. I would believe this if she wasn't so attractive and hope that you guys will be able to either help me show that I'm right to her or prove me wrong and be able to help me just let it go.