Again, currents laws are archaic and sexist. They were based around a society where women didn't work or go to school, and normally got sole custody because they birthed the child, and were the common care givers at the time. Since Divorce was becoming a much more common thing, LAWS WERE MADE to reflect this to protect those women that devoted their lives to children and home.
Two people both want a separation, and to give the women and child a better chance at a good life, they made child support laws.
Since then someone huge has changed in terms of choice: Abortions became legal and much more common. With abortions, females got an option out of an unwanted child. Men, still, do not. Barring rape, both parties go into the act of sex know the risk. If the female isn't at a time in their life where they are read for, or economically stable enough to have a child, they have an option out of this. Men do not. Men are at the whims of the female. Her choice will directly change his life. This is unfair, and sexist.
Upon finding out the female is pregnant, the male should be allowed to opt out. It is then her choice to keep it or not. If she decides to keep it, its 100% her choice, even knowing the male will not be there.
Unfair, sexist, archaic laws.