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Steve T said:
i believe over heer if you go through the official channels to get a sperm donor, his resposibility is wavered.



This is only the case if you're an anonymous donor.

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I didn't gett he impression these women relied on the donor for support as a couple once his donation was made. It was only after the couple split that the mother demanded money



It doesn't really make much difference. The point being that because her spouse is another woman who is not biologically related to the children, the man is left with their mess.