Sperm donation is also volountary, altruistic and (different to the UK) anonymous.
Healthy young men are checked for: good mental and physical health, absence of hereditary diseases or, asthma, diabetes, epilepsy and hypertension. Negative for: AIDS, Hepatitis B and C, Chlamydia, Herpes, Gonorrhea, Syphilis and Cytomegalovirus.
Sperm is produced, frozen and stored in liquid nitrogen banks, and the donor checked again after 6 months for the above infectious diseases. Only sperm of proven fertility after thawing is used for donation.
Sperm donation is used for couples where the male partner has no sperm or problems with sperm function and physiology, where sperm cannot be used owing to genetic , hereditary or infective disease. Single women or same sex couples.