Men can get a vasectomy, if they are 100% sure they don't want kids, ever.
Women can get a copper IUD with no hormonal side effects inserted in a few minutes and will be protected against pregnancy for up to 10 years (or can opt to have it removed at any time).
If pregnancy occurs, women can just order pills online [0] that will stop it (as long as they detect it in the early stages). Men have no control in the matter. If a woman decides to go forth with a pregnancy against the man's will, he can either abandon his child and have his wages garnished for 18 years, or accept his new situation and become a father.
To be clear, I think the idea that a woman's partner should have any control over whether she gets an abortion is absurd. But women clearly have the advantage when it comes to reproductive choices right now. I hope male birth control pills can help change that.
I guess there are child support for males wrt to (b), which could very well incentivize the use of a male pill.