Most Helpful Guy
In all honesty, there's one thing most guys here seem to not talk about, but that is that we are very much like you girls - if we are not attracted to you then there's not much really that can or will change that.
So basically it's ...
1) The guy has to be attracted to you, otherwise you are very, very likely to end up in the friend zone
2) If you are attractive to him, then don't make the opening line like you are taking the piss out of him (one girl, a cute one, once approached me at my college library - I had never seem her before but apparently we were studying the same thing, but I was there often and her first words were "Do you live here?" ...instant "ignore-on" mode from me to her from then on)