I don't think people are really thinking very hard when they are advocating "for equality" by saying that men should have a right to say whether there should be an abortion or not.
What if the woman says that she doesn't want to abort but the man does? What happens now? Well this is what I think will happen:
No matter what the man says, the decision is up to the woman if she wants to undergo the abortion as, after all, the feotus is part of her and the procedure affects the woman physically. No woman should be forced to undergo the procedure.
But what about the man? Should he pay for the costs? I think this should be resolved in a case by case basis by court. Things like" whether the man was careless and did not bother using contraceptives" should be explored in the court case.
However one would wonder if this can do more harm than good if the man breaks up with the single mother as she would be left if essentially no source of income (if the court decided that the man didn't have to pay for child support).