Professional sperm donor here: Professional sperm donors are screened extensively by the sperm bank. This entails physical examination, psychological examination, social examination, family health history examination, and genetic examination. Additionally, one must produce a considerably more sperm than the average male. One enters a contract to donate at least once a week for a year-long period, though one may donate as frequently as three times a week, provided sperm quality does not suffer.  Travel to regions with endemic disease is forbidden. Unprotected sex with new partners is forbidden. One must abstain for a minimum of 48 hours prior to donation.  A donor is tested for urine metabolites and STDs on a monthly basis. Blood tests for STDs and health screening are conducted every three months. Every six months, the donor must undergo physical examination by a licensed physician.  In return, the donor receives some sum of money for every donation he makes. He may be compensated further for opting into identity release programs (the identity of the donor is released to the conceived child after 18 years).  Donors must have college degrees, be taller than 5'9", have BMIs lower than 25, be fit and sociable, and accomplished.  We have no say in who purchases our sperm. But if you believe in eugenics, that doesn't matter anyway.