Just learn to finish outside a girl unless both of you want to take a chance of her getting pregnant. Of course there's a chance of getting pregnant. That's the whole idea of having intercourse so that there's always a chance of the girl getting pregnant. If she's not on birth control and you're not wearing a condom spill your stuff anywhere but there.
Yes. Even if you come on the outside, gravity could take over and if even a little gets in, she could get pregnant. It's possible, there's a name for that kind of impregnation, but I forget. A guy can finish inside a girl, though when comparing the odds of getting pregnant vs. not, there's a much higher chance she will get pregnant. Just use a condom, it's so much safer in so many ways.
finish away...who cares about the girl- if she gets pregnant you can always just leave her to live off welfare with her new baby.
Just finish on her in her..wherever you want...no chance in getting pregnant!
PS- Please note the sarcasm in this post...a girl can always get pregnant when there is sex involved. Please keep your penis in your pants and go back to school and take sex education again...there is a lot you need to learn before you have sex.