The problem with sperm donors
This New York Times article “One Sperm Donor, 150 offspring” highlights the dangers of artificial insemination from a genetic perspective. The science-based concerns back up the moral and ethical questions surrounding this as well:
Now, there is growing concern among parents, donors and medical experts about potential negative consequences of having so many children fathered by the same donors, including the possibility that genes for rare diseases could be spread more widely through the population. Some experts are even calling attention to the increased odds of accidental incest between half sisters and half brothers, who often live close to one another.