Every time I see a story like this I think of this quote. "Science has made us gods even before we are worthy of being men."
Jean Rostand
Every time I see a story like this I think of the oldMargarine ad with the lightening and thunder and the threatening voice from the heavens, "It's not NICE to fool Mother Nature."
This man and woman have a beautiful family and have forged a very nice relationship -- for now. I'd be surprised if it stays that amicable. The mother obviously wants more from the father. Perhaps the father does too, but he also wants solitude; and it won't be long before he becomes resentful of the demands having a family puts on him. He also doesn't sound like he is very wealthy, so what he can give the kids has to come directly out of his own time. That's great, but it wasn't his bargain.
Of course, I think his reason for becomimg a donor in the first place was really stupid and selfish.
And I think it is just creepy to be giving children sperm pins and taking them on tours of sperm banks and talking so openly about what should be a private and sacred act.
And wait until the other woman finds out who he is and he has another family to deal with! Eeeeeek!