First off, this is the first girl I've been with(and I'm the first guy she's been with), so I'm not sure if this is normal or not. Whenever we're having sex, and she seems to be getting really into it, all of the sudden she says she has to go pee. Every single time. And afterward that always just takes me out of the mood. Anybody know why this is happening? Is it her problem? Mine? What?