Having a child out of wedlock and putting it up for adoption is a brave and honorable thing for a single woman to do if she does not want or is unable to raise the child. I can understand a desire to make such an difficult situation a little less difficult.
However, I don't see how a father can surrender his parental rights when he never even knew he was a father. Expecting someone to register any time they have sex outside of marriage is not a reasonable expectation and is also an egregious invasion of privacy.
It is a difficult issue, but this is not a reasonable or acceptable solution.
In every other legal cause, it's the responsibility of the moving party to notify other parties to the cause.
This has the effect of lowering the bar...further...for women in regards to family law.
Could he waive any obligation by registering?
(yes, I know, it's a rhetorical question.)