This isn't my situation, but I was thinking about this. My g/f's slutty friend has had a lot of sex with random guys. A few times they don't use condoms and they just pull out. She isn't pregnant, and she also isn't on the pill. I thought if you didn't use a condom and she wasn't on the pill it was almost a garentee. What are the chances of getting pregnant while using no protection except pulling out?