The only difference is that a man is not even allowed that "possibility"
It is her body so she gets a "veto" in that she can choose not to give birth.If a child is born of two people and they both bear responsibility for that child. They both chose to have sex and so . She has a veto that may be morally repugnant to her, but it is her body.
It is his bank account, so he gets a "veto" in that he can choose not to pay support.
That is the fair way.
With your suggestion one has all of the control (a "veto" via an abortion) but they split the responsibility. In our way each has a veto for their own responsibility.