Arm in Arm

Hey girls, I´m a guy a I know from experience that any guy likes it when a girl raps her arm around his whilst walking together(at school or any where), you know, arm in arm. Try to make some kind of excuse like "come here, wait a sec" and talk about any thing but at the same time arm in arm. Trust me,I know cus there are 2 girls in my class that always walk around arm in arm with me and I definitely like it(but they´re friends, but it still turns me on lol). Hey and also if any of u girls can give some advise on how to tell if a girl likes you, thanks!!