Lately before sex my girlfriend will not be wet, and we end up using lube. This all started after we would be having sex for a very long time and have to use it. We do not use condoms. I am wondering if this is normal? She claims that its better then the past, but somehow I doubt this. Even if she fingers herself she will not get wet. Any comments/suggestions on whats wrong or what to do? I'm getting very self concious