Why do guys call a girl by her last name??

Anonymous
1) why do guys call a girl by her last name (but still show one sign of interest -ex: touching her)

2) why do guys laugh/talk really loudly around a girl?

3) why do guys try and get a reaction out of girl?

4) signs a guy likes you (if he's shy vs aggressive)

5) signs he wants your attention (by talking to you or not)

Why do guys call a girl by her last name??
3 Opinion