As is the woman, yet she can decide to have no responsibility at all, and also decide if the man has any responsibility at all.
Except for rape, the woman was an equal party to the choice. Yet she gets 100% of the power to decide if he has any responsibility or not. He has no say at all in his responsibility.
Equality is being treated equally by the law. When one party has 100% of the power to decide what the other party does when both parties are equally responsibile, equality is not found.
The consent to have sex also includes an acceptance of the risks inherent to that decision, such as pregnancy, contracting disease, ect. You are basically of the opinion that a man should get two decisions: to consent to sex and parenthood as separate decisions.
I believe the OP is somewhat misleading as it implies that abortion is a routine procedure carrying no risk. The fact is that one a pregnancy occurs there are risks, regardless of if it ends in a birth or not. It causes a woman's body to undergo rapid changes that impact both her physical and mental health. Having an abortion does not mean a woman chooses "no responsibility," it means she chooses to accept the risks of that course of action. It is her choice to do with her womb as she will.
Perhaps a more accurate title would be "Child Support in the Era of Loveless Sex."
I think we are also getting so narrow in scope as to discuss a situation that is relatively rare. It's likely most women will consider the father's desires when choosing to carry to term or abort. That doesn't mean she should be required to ABIDE by the man's choice given that if he disappears she incurs all potential risks.
At the end of the day even in this situation men do have a choice about fatherhood. They can always refuse to pay child support and accept the consequences of that decision as well. That may be a shitty choice, but it is a choice nonetheless.
I'm not really convinced by your statements about equality. Equality is an ideal, not a destination, and there will always be situations where it is murky at best and unobtainable at worst. There are many laws that do not treat people equally along various characteristics. There are also laws and policies that exist where individuals give up or lose their rights for various reasons without fully understanding the repercussions...for example, when signing a software licensing agreement.
Remember that those father's who create children they do not provide for place that burden upon not only the mother, but society as well. In these rare cases, society has to choose what is best for society as a whole; not necessarily for the individuals involved.