In a pregnancy, if a woman wants to have the child and the guy doesn't, she can, and the law will hold him acountable regardless of what he wants. If a woman wants to abort, she can abort without consulting the partner and go on with her life, the man has no say in the life that they conceived together.
If by chance the man wants the woman to give birth to his child and raise it on his own, with her being held accountable for support, he doesn't have that right either, even though this is all a 50/50 venture from the start. It's far from equal.