I actually just learned first hand this weekend, unfortunitly before I read this, how not to finger a girl. I started out with the "come hither" technique and then I started moving my fingers in and out. I asked her if it hurt and she said no, it feels great, dont stop. So I kept going harder and harder asking if it hurt and she stil said it felt great. I look at her pussy for a second and notice my fingers had blood on them. We talked about it and she said everything felt great, and that she is definatly not on her period. Anyway, i will never do that again.