That wouldn't really work.
What if the man is just deadset against it but the woman has a good reason for doing it. She would be forced to give birth where it may be dangerous.
Plus, speaking personally, it's not a responsibility I want. As I said, I personally would never be able to concede to an abortion of a child I helped create. I think it's cowardly and selfish, and I just don't want the guilt that would most likely follow in it's wake. However, I don't want to be the deciding factor in if she is allowed to get one or not. I wouldn't want to force her into having a child simply because of my personal views.
In the end, it is her body, and she should be able to do with it as she pleases, even if I don't agree.