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After a child has been created, the parents have forfeited their unilateral decision making opportunities. Each adults personal decisions for themselves become secondary to the welfare of the child from there on out.
Giving the man a veto on putting the child up for adoption would likely get you lynched by feminists.
Here's an alternate proposal: the woman gets to specify a level of child support she feels is fair. The man gets to decide whether to pay the support, or take custody of the child and have the woman be legally liable for the child support.
Hear, hear!