The other difference is that men already have no legal reproductive rights, and have never had any reproductive rights.

This is the grand truth of it. If a pair get pregnant she can decide, without his consent, to kill the kid, and he'll never be the wiser if nobody tells him. If she decides to move away and have the kid, then give it up for adoption, he's shit out of luck if she doesn't name him as the father. If she decides to keep the kid, then he's on the hook for 18 years. His rights in regards to the unborn child? Jack shit. If she gets the right to try and kill the kid if she doesn't want it, then the least they could do is give the man the legal right to disown the bastard and sever all parental rights and responsibilities to it if he doesn't want it.