Not the sort of question you should be asking men, but if you want this relationship to last, i wouldn't be giving in to easy, it's the quality that matters and if all she's after is sex then she isn't good girlfriend material, how many others has she been with? I'd be cautious if i was you, make sure she defo is 16 aswell, far too many girls lie about they're age these days, i know i used too..........