Most Helpful Guy
I'm currently in college now and if there is an attractive girl in one of my classes and I'm interested, I will talk to her when its appropriate. (before/after class.) I will usually go into the conversation with lite topics like classes and what not at first and if I become more interested I will ask more personal questions. i.e.(things about her and her life, not just school related topics.) One dead giveaway for me is that I would continue to talk with her and get to know her as the semester goes on. If I became not interested at all I wouldn't initiate a conversation much anymore.