Life isn't fair, but justice ought to be.
> The problem is that there won't be a system that will allow for men to say "I don't want it" which won't be exploited, and children suffer
Exploitability holds less weight to me than legal fairness. "Think of the children" is more often than not used to justify facilitating unfair actions, in my view.
The problem is that there won't be a system that will allow for men to say "I don't want it" which won't be exploited, and children suffer, it suck yes, but we should rather focus on ensuring that both parents will have fair access to the child and act in it's best interests.
BTW if the woman gets another partner who becomes the legal parent of the child then you are in the clear for child support in most cases.