I think it should be established early in the pregnancy. Which is not the way it is now. 9 times out of 10 you're gonna have to pay child support. If the man never consents to having kids he should be able to opt out the moment he knows about it.

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I find it somewhat strange I'm being down voted because it's an argument for equality really that's it. I suppose you could boil it down

"is pregnancy as equal a burden to paying child support for 18 years?"

Should a man force a woman to give birth even if she doesn't want it?

Should woman force a man to pay child support even if he doesn't want it?

Even if you're in a committed relationship as long as you believe it's ok for the woman to get an abortion whenever she wants, you should believe a man should be able to opt-out of Parenthood (before the baby is born, when the mother finds out)