If you don't want children, then it is up to you to make sure that fact is known and discussed with your partner. Also, it means that you should be very careful with contraception. Accidental pregnancies happen but they can be prevented 95% of the time if both parties are consciously using the proper contraceptives. I mean using condoms, or the guy gets a vasectomy. The female can get an IUD, Birth Control Pills, Depo, Etc. You can't just rely on the other person to have it covered. You both have to be responsible. When the girl gets pregnant, then responsibility must be taken. It's HER body. If she wants to carry it and give birth to the child and raise it, then so be it, but it's half of the guy involved. If the proper contraceptives were used the pregnancy may not have happened at all, so remember that when we are coming after you to start helping with the baby. You can't say "Well she wanted it, I didn't." You can't expect a girl to have an abortion just because you didn't want the baby at all. Some girls can have an abortion no problem. Some, like me, can have one and regret it. It's a touch thing. I am pro-choice, but personally I wouldn't ever have another abortion unless it was a pregnancy that was a result from rape. That's my personal choice on the matter, whatever others' reasons are, are their own. So if a guy gets a girl pregnant hell yes it's up to him to fulfill his end of the duties. You can't just get a girl pregnant and think you're going to walk away scot-free. Should have used a condom. Should have made sure the female was on some kind of BC. Of course there are loopholes. Like if the girl is a whackjob and pretends to take BC pills or pokes holes in your condoms trying to fake an accidental pregnancy and if you can prove she did that, then yeah I think the guy should be free of responsibility over that baby.
In the end, it boils down to safe sex practices. YOU RUN THE RISK OF PREGNANCY EACH TIME YOU HAVE SEX. It's a consequence of it. It's science. IF YOU DON'T THINK YOU CAN HANDLE THE CONSEQUENCES OF YOUR ACTIONS THAT LEAD TO PREGNANCY, THEN DON'T HAVE SEX.
That is how I feel about that.