The thing is, abortion does exist making the point relevant.
current system..
1. man wants child woman wants child, both are responsible.
2. man wants child, woman does not, abortion
3. man doesn't want child, woman does, both are responsible.
4. no one wants the child, so abortion and no one is responsible.
My system, whom ever wants to have a child will have to pay for it, period.
I do not see any problem with that because it is the woman who wants the child. When the man want the child and the mother doesn't want to abort then it should be the man paying for it. But you should not have to pay for what someone else happens to want.
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Nothing about that makes it any less of a choice.