The thing about donorship is that it can cause intense degrees of unhappiness for the donor-conceived. Not sure how many of the adults invloved would go for donorship if they knew that. Some are lured in by the fertility industry. You can Google the phrase Tangled Webs to see how the donor conceived fare. Though there are a few sites called that, you will see the donor-conceiveds' one if you scrioll down. There is also a site called DonorMisconception to see.