Make a pre-sex contract. I know that the law is there to "protect the rights of the child," which, roughly translated means "we don't want to pay for anyone's kids." The kids are just a shield used by society.
I strongly believe that there should be an option for both parties upon impregnation, especially if a contract was signed prior stating that both parties were entering into a sexual relationship with the full understanding that you have no interest in raising a child in any way, shape, or form. Say, have the full cash amount of an abortion AT HAND in front of a notary republic, justice of the peace, judge, magistrate, etc., and declare that you are willing to foot the entire price of the abortion. Along with that, you are willing to break off any and all relations now and say, for a five or ten year period of time (or even in perpetuity) with this person so that the same thing cannot happen again. Place the money in front of the judge, well away from the man's hands. This is where the choice comes in. If the woman accepts, then fine and dandy, they are of a single mind. The man was able to excercise a choice, and the woman was also. The money goes to an abortion, and we'll even say an extra thousand or two for post-abortive therapy.
However, if the woman decides that she wants the child, even after signing the pre-sex contract with full disclosure, then the man should have the money returned to him and he must sign a legal, binding document which states that he gives up any and all rights to this child, both real and implied (monetary, emotional, visitation, etc.) in perpetuity, if he does not want to pay child support and wants nothing to do with this vile entrapment. Even enforce a chemical sterilization upon him for a period of a few years, if necessary. He is then allowed to walk. He has upheld his end. The woman is still allowed to have her choice. She chose to keep the child, and so the man should not be able to deny that. However, she should not be able to imprison him and his checkbook just because she chose selfishness over common sense.
And that's the key. No one should be permitted to enslave another person just because of selfish desires. If a man rapes a woman with the deliberate intent of impregnating her, then the deal obviously doesn't stand. He should not force upon her a child she would not want just to lay a claim over her. She should be given the option of the abortion or adoption or child support. But at that point, it is a criminal proceeding, not civil, and so goes beyond the concept originally discussed here.
Slavery is a vile thing. Bending another to one's desires without any freedom of choice or action. The condition of being subject to a specified influence. These people who decide they have to have these children without any forethought as to how they will raise them save for the enslavement of the other party involved.
A child should never be used as a weapon. This world is moving faster and faster to "he who whines loudest gets the most," and that's not how it should be. It should be a matter of stand upon your own feet. A matter of choice and responsibility. You cannot say "it takes two to tango, so pony up the cash, buster," when the man has no choice in the matter other than "keep it in your pants." When one side has all of the choices, that's inequality at its worst. Equality is one thing I believe in. Not slavery. Choice.