A girlfriend isn't just someone who you're with to hook up with, man......if thats all you're looking for then you shouldn't have asked her out in the first place. In all honesty, if her weight is something that is preventing you from being intimate with her...let her go..because she definitely deserves to be with a guy that isn't judgemental..which you apparently are (by your words.) By the way..160lbs isn't all that heavy. Please, do try and grow up. There is more to a relationship than a person's looks (looks are the first thing to go in life..as you age..remember that.)