So my girlfriend, 17 and I, 16, just had sex for the first time recently, but it wasn't too great. She hurt quite a bit when I went in a little too far, but it's always supposed to hurt for the girl the first time, I hear, so she let me so that we could get it over with. About a week later we tried again, and it hurt just as bad for her. How long after the first time does it take before it doesn't hurt for the girl? I hate hurting her but we both want to have sex so we don't really know how long to wait or what to do. Is there any way of knowing how long?