Okay I am not trying to be mean, but I am tired of people asking questions like this. If you aren't prepared to have a baby, if it happens, don't do what it takes to get pregnant.
And if you had to ask the question that you asked it is apparent that you shouldn't be having sex anyway, because that question shows that you don't know the first the about reproductive organs. Try to understand this, sex is a lot more than pleasure, and the reason that so many people are out to get an abortion or another form of it in the morning after pill, is because they are to stupid too understand that.