What if she said she was on birth control so he didn't use a condom but then the birth control didn't work?
Prove it. Then a man isn't liable.
Sure, that won't be abused from day one.I agreed above that child support from conception seems very reasonable to me.This would be very difficult to prove. What do you propose? They both sign affidavits prior to each and every encounter?As above. But this is a major practical concern.
How would you propose determining the facts in each case?
You view financial responsibility as being as responsible as a woman now being forced to carry a pregnancy to term? There are many potential short and long term ramifications to pregnancy including many health issues and even death. A man will just deny paternity and then not pay. Meanwhile, a woman can potentially be on bed rest with no viable way to support herself and may end up with many long term complications from pregnancy (including death). Which brings another interesting point - who is responsible for the death of a woman who died from pregnancy/childbirth of an unwanted pregnancy?
A man will have to figure out a way to document that did have the discussion and the woman agreed, otherwise he is liable to have an "unwanted pregnancy" claim against him. It should be easier than proving rape in many cases.
All pregnancies should be "unwanted" unless proven otherwise by documentation or the affidavit of the pregnant woman. That puts the legal liability of the man since the medical, health and financial liability is really on the woman.