How to get through the first few days of a woman living with your boyfriend?

I don't care if she is she is his bestfriend or not, no woman should be spending the night at your boyfriends house no matter what. In my oppinion that is wrong, and I would feel very uncomfortable, I mean maybe if you guys lived together or something, but that is wrong, how would HE feel if your male best friends spent a few months with you alone?