Having children naturally is not always an option for everyone. One problem many men experience is infertility or a low sperm count. One solution to this problem is the use of donor sperm.
A man who wishes to donate his sperm can do so privately or through friends who are looking to have a child.He can also make use of one of the many donor clinics or sperm banks where he will be vetted and tested for illness, hereditary abnormalities or sexually transmitted diseases, as well as age before his sperm will be accepted. The donor in most cases has no more to do with the process once he has desposited his sperm sample.
Sperm samples are then used in "in vitro fertilisation (IVF)" procedures where a woman is artificially inseminated with an egg already fertilised by a donor sperm.
There are more and more donors being sought, especially in Western countries not only to ensure a wide gene pool and reduce the chance of a large number of half-brothers and half-sisters being concentrated in one area but also because IVF is not always successful and a relatively high amount of semen is required per treatment.
If you decide to use donor sperm to get pregnant be aware that many countries now provide details of the donor, where asked and anonymous donations are not as common as they once were. This means that your child may at some point wish to trace their biological father.
You should discuss all the options and possible consequences with all parties before you make your decision.
From angelababy In Q&A