Once the child is born their legal obligations are similar. Both are subject to child support if they want 'out', unless they agree to put the child up for adoption.
Arguably this means men need to plan ahead more or take additional precautions. I don't think that's unreasonable considering men will never have to pay the physical price of childbearing.
Noone can plan for a popped condom, and pregnancy comes when aditional precautions fail, and they fail for both people involved, not just for men... but we then give only one of them an option to get rid of 20+ years of responsibilities.
What I do (thankfully it has happened only a couple of times) is to buy the pill together with the woman at the next day and be present when she takes it. Trust, but verify.
Like what? A condom? That applies to women too, if they don't intend to have kids, use a condom (rape excluded). But we give them ther ways out too. If the condom pops, the next step would be a day after pill. That applies to women, men get no say in that. Abortion? Same. What reasonable measures does a man have after a bad condom?