Thanks to an absence of regulation, America is a notable exporter of human sperm.
The most obvious gap is a legal limit on the number of children a sperm-clinic donor, however tall and brilliant he may be, can help create. America is one of the few countries to have no such cap (Britain, by comparison, has a limit of ten donor-created families per donor).
Many observers would also like a law requiring clinics to do more comprehensive screening for health conditions. In2oi4 a once popular donor who had fathered innumerable children in several states and at least two other countries was found to have lied about being a polyglot neuroscientist
with an IQ of i6o and perfect health. He was rather a university drop out with a criminal record and several health disorders.