I think since it's a woman's body she can decide whether or not to have the abortion. There are some risks associated with having abortions so it's not necessarily a light matter to just allow another human being to make for you. With that being said, I don't think it's fair to make a man responsible for a child he did not want. I think he should be able to sign away his rights as a father and not be forced to pay child support for a child he did not want.
But the woman can keep it without the mans consent, then they turn around and use the kids as pawns and tell the man you're responsible for them.