I think if you used a condom it would be fine. If you daty you might get something if you have chapped lips, or a cut in your mouth. If she has nothing, you're fine, but thre's no way for you to really know. I think you can also get something from under your finger nails. If you're using digits, right where the nail meets the tip of your finger under the nail is sorta like a cut. I can't explain it any better.