there is a possibily that the sperm might swim to the virgina, but from my personal experience, the chances are very low
if you are so concern, i think you should eight bring the gf (or go, if you are the girl) to the doctor or go to pharmacy by pregnancy test. the pregnancy test is not that expensive anyway
2007-05-12 00:32:39 補充:
sorry, i accidently type the "eight"please ignore it