To be a sperm donor must meet many requirements that make the candidate of percentage is very high. Donors must not only have perfect health, but also must have high quality semen and a family history of inherited diseases that do not appear.
They are also taken into account factors such as physical appearance and personality, although these features are primarily collected to help select a candidate based on their affinity for the receptors of the sperm donation. In terms of the intelligence just have a normal IQ to be a donor.